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Ernie Ball 7-String Skinny Top Heavy Bottom Slinky Cobalt Electric Guitar Strings, 10-62 Gauge (P02730)

4.8 4.8 out of 5 stars 1,634 ratings
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Amazon's Choice in Electric Guitar Strings by Ernie Ball
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Skinny Top Heavy Bottom (10-62)
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Purchase options and add-ons

Brand Ernie Ball
String Gauge Custom
Color Skinny Top Heavy Bottom (10-62)
Instrument Electric Guitar
String Material Type Stainless Steel

About this item

  • Cobalt produces a stronger magnetic relationship between pickups and strings than any other alloy previously available
  • Cobalt electric guitar strings provide an extended dynamic range, incredible harmonic response, strong low end, and crisp, clear highs
  • Wound strings consist of Ernie Ball’s Cobalt alloy wrapped around a tin-plated high-carbon steel core wire
  • Engineered to maximize output and clarity
  • Made in California, USA with the finest and freshest materials

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Ernie Ball 7-String Skinny Top Heavy Bottom Slinky Cobalt Electric Guitar Strings, 10-62 Gauge (P02730)
$14.99
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Ernie Ball 7-String Regular Slinky Nickel Wound Electric Guitar Strings, 10-56 Gauge (P02621)
$8.99
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JIM DUNLOP Heavy Core Korn Guitar Strings 10/65-7/Set
$10.89
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Ernie Ball 7-String Skinny Top Heavy Bottom Slinky Cobalt Electric Guitar Strings, 10-62 Gauge (P02730)

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WARNING:

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Product Description

Engineered to maximize output and clarity, Ernie Ball Cobalt Slinky 7-string guitar string sets are one of the latest innovations in string technology. Seeking to provide guitarists and bassists with a new voice, Cobalt strings provide an extended dynamic range, incredible harmonic response, increased low end, and crisp, clear highs. Cobalt provides a stronger magnetic relationship between pickups and strings than any other alloy previously available.

Top Brand: Ernie Ball

Highly Rated
100K+ customers rate items from this brand highly
Trending
100K+ orders for this brand in past 3 months
Low Returns
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From the manufacturer


cobalt
  • Cobalt increases attraction between your strings and the magnets in your pickups
  • Enhanced output
  • Incredible harmonic response
  • Increased low end
  • Crisp, clear highs

Cobalt Slinky 7-String Guitar Strings

Engineered to maximize output and clarity, Ernie Ball Cobalt Slinky guitar strings are one of the latest innovations in string technology. Seeking to provide guitarists and bassists with a new voice, Cobalt strings provide an extended dynamic range, incredible harmonic response, increased low end, and crisp, clear highs. Cobalt provides a stronger magnetic relationship between pickups and strings than any other alloy previously available.

Plain Strings

All plain strings feature a series of lock twists to secure the wire around the ball end, enhancing stability and strength.

Wound Strings

Cobalt Slinky strings are precision wound with a patented iron-cobalt alloy wire providing higher output and clarity.

Core

The core is made from tin plated high carbon steel hex wire, providing excellent durability.

Jeff Loomis

Jeff Loomis plays 7-String Cobalt Regular Slinky 10 - 56.

Tony MacAlpine

Tony MacAlpine plays 7-String Cobalt Regular Slinky 10 - 56.

Jason Richardson

Jason Richardson plays 7-String Cobalt Regular Slinky 10 - 56.

Keith Merrow

Keith Merrow plays 7-String Cobalt Super Slinky 9 - 52.

Stainless Steel Pure Nickel Nickel Wound Cobalt M-Steel
Customer Reviews
4.6 out of 5 stars
2,045
4.8 out of 5 stars
13,246
4.8 out of 5 stars
24,785
4.7 out of 5 stars
8,532
4.6 out of 5 stars
1,662
Price $5.99 $7.99 $6.99 $9.99 $12.99
Tone Bright Warm, Vintage Classic, Balanced Clear and Bright Clear with Strong Lows
Output Moderate/Normal Vintage/Mild Moderate/Normal High Ultra High
Wrap Wire Stainless Steel Pure Nickel Nickel-plated Steel Cobalt Alloy Super Cobalt Alloy
Core Wire High-carbon steel, hex core High-carbon steel, hex core High-carbon steel, hex core High-carbon steel, hex core M-Steel
Plain Strings Standard Standard Standard Standard Black RPS
7-String Set? ✓ ✓

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This Item
Ernie Ball 7-String Skinny Top Heavy Bottom Slinky Cobalt Electric Guitar Strings, 10-62 Gauge (P02730)
Ernie Ball 7-String Skinny Top Heavy Bottom Slinky Cobalt Electric Guitar Strings, 10-62 Gauge (P02730)
Recommendations
Ernie Ball 7-String Skinny Top Heavy Bottom Slinky Nickel Wound Electric Guitar Strings, 10-62 Gauge (P02615)
Ernie Ball 7-String Skinny Top Heavy Bottom Slinky Nickel Wound Electric Guitar Strings, 10-62 Gauge (P02615)
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Ernie Ball Paradigm 7-String Skinny Top Heavy Bottom Slinky Electric Guitar Strings, 10-52 Gauge (P02030)
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Ernie Ball 12 Sets 2221 Regular Slinky Strings with Picks
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Price$14.99$8.99$11.95$10.89$16.99-13% $59.79
Typical: $68.99
Delivery
Get it as soon as Sunday, May 12
Get it as soon as Sunday, May 12
Get it as soon as Sunday, May 12
Get it as soon as Sunday, May 12
Get it as soon as Sunday, May 12
Get it as soon as Sunday, May 12
Customer Ratings
4.84.8 out of 5 stars1,634
4.84.8 out of 5 stars24,785
4.34.3 out of 5 stars56
4.74.7 out of 5 stars157
4.74.7 out of 5 stars3,098
4.74.7 out of 5 stars164
Longevity
4.3
4.4
3.7
4.7
3.9
—
Stability
—
4.6
3.8
4.8
4.2
—
Brightness
—
4.6
3.7
4.8
4.1
—
Value for money
4.3
4.7
—
—
3.8
—
Sold By
Amazon.com
Amazon.com
Amazon.com
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Monroe Company LTD
instrument
Electric Guitar
Electric Guitar
Electric Guitar
Electric Guitar
Electric Guitar
—
string material
Stainless Steel
—
Nickel
Nickel
Coated Nickel
Alloy Steel
string gauge
Custom
Heavy
10/63
10/65
Custom
0.01

Looking for specific info?

Customer reviews

4.8 out of 5 stars
4.8 out of 5
1,634 global ratings

Customers say

Customers like the sound quality, quality and value of the musical instrument strings. For example, they mention that they make their guitars sound good, they give it a solid tone and that they have no problems with them. Some appreciate the tuning, performance, and brightness. That said, opinions are mixed on durability and comfort.

AI-generated from the text of customer reviews

78 customers mention71 positive7 negative

Customers are satisfied with the sound quality of the musical instrument strings. They mention that they sound amazing, give their guitar a solid tone, and have a better tone response than anything they've played. Some say that the strings sound new even after several weeks of heavy playing. Overall, most are happy with the tone and quality of these strings.

"...(lots of harmonics, plenty of mids and they feel amazing for strings made of standard..." Read more

"These have clean solid tones, I’m definitely impressed!" Read more

"...Then I go to play. And (In Joe dirt voice) DANG!! The sound is so clear and vibrant!! 110% difference!..." Read more

"...These strings are amazing! They sound great for jamming metal!..." Read more

61 customers mention44 positive17 negative

Customers like the quality of the musical instrument strings. They mention that they sound great, are great for metal, and have no problems with them. The thicker bottom strings work wonders to keep the guitar in tune. They also say that the strings have more output than others and add a lot to the top end. Customers also say the strings are a decent gauge for 7 string electric and re-string perfectly.

"...the guitar since he was a kid and he says these are the best strings he has ever played with! Definitely gonna be buying more!" Read more

"Really good strings love the way they sound!" Read more

"...But they are not the strings for the extra clearity and brightness for recording, or gigging. Sometimes you gotta just listen to what sounds best...." Read more

"...The price is great and so far the strings have held up to a 14 yr old future rocker." Read more

23 customers mention18 positive5 negative

Customers like the value of the musical instrument strings. They say the sound is clear, vibrant, and brilliant. They also say the tone is bright and crisp. Some say the strings are the best looking and sounding they've ever had.

"...which are very full and lively..." Read more

"...And (In Joe dirt voice) DANG!! The sound is so clear and vibrant!! 110% difference!..." Read more

"...They sound like no other, with an extra high/mid brilliance that gives a serious bite...." Read more

"...Overall the strings don't sound bad for Metal, but not worth the hassle." Read more

12 customers mention12 positive0 negative

Customers are satisfied with the tuning of the musical instrument strings. They mention that they hold tune pretty well, are great for metal, and do a good job holding lower tunings. Some say that the strings jangle very well and would be great for a guitar with pickups.

"...They jangle very well and would be great for a guitar/pickups that are a little clogged up in the midrange...." Read more

"Put these strings on my PRS Custom 24 - 7 string, tuned to drop F. Stays in tune and sounds vicious when playing with my Fuzzlord Effects Drone..." Read more

"These strings are heavy and hold tune fantastically...." Read more

"...and intonation to these strings and my Jackson sings and holds tune pretty well now." Read more

7 customers mention7 positive0 negative

Customers are satisfied with the performance of the musical instrument strings. They mention that they work well for GDGCFAD, and are good for lows and highs.

"It is slinky. Not what I intended but works well" Read more

"These strings work great for GDGCFAD, they feel like silk compared to the Jim Dunlops I used to use...." Read more

"Well made and performs as advertised. Recommended!" Read more

"...I use them for half a step down tuning and they work great!" Read more

6 customers mention6 positive0 negative

Customers like the brightness of the musical instrument strings. They mention that they are bright, with a deep rich tone. Some say that the strings are light on the high strings and beefy and tight on the lows.

"I like the combination of light top and heavy bottom strings, the sound great for heavier music" Read more

"These are my go-to 7-string strings for drop Ab. Nice and light on the high strings but pretty beefy and tight on the lows...." Read more

"I bought these heavier gauge strings for my 7 string. They are nice and bright and punchy!..." Read more

"...They ate truely brilliant and bright with a deep rich tone. I love the the Cobalt Series is all I use." Read more

29 customers mention19 positive10 negative

Customers are mixed about the durability of the musical instrument strings. Some mention that they have amazing durability and just unrivaled sound, while others say that they broke on the second day of usage, did not have a prolonged life, and that one was broken from the factory.

"...Treated strings are great for durability...." Read more

"...Sound is good but don't last too long" Read more

"...The price is great and so far the strings have held up to a 14 yr old future rocker." Read more

"Strings last a very long time. Amazing durability and just un rivaled sound. Everyone should buy these amazing strings. All hail ernie ball strings" Read more

24 customers mention15 positive9 negative

Customers are mixed about the comfort of the musical instrument strings. Some mention that they feel very nice to play on, amazing for strings made of standard materials, and smooth to play. Others say that they are a bit rougher than what they are used to, and harsh to the touch.

"...(lots of harmonics, plenty of mids and they feel amazing for strings made of standard materials)...." Read more

"...these strings on a cheap Ibanez gio 7 string and they immediately improved the feel an tone of the guitar...." Read more

"...anyone about who hasnt used them before is that the wound strings are very harsh feeling on your fingertips when new but this does go away as they..." Read more

"...I love the balance that's offered in the gauge span, super comfortable to play...." Read more

All time favorites, brilliance, attack, clarity, stamina.
5 Stars
All time favorites, brilliance, attack, clarity, stamina.
My go to strings, every time. They sound like no other, with an extra high/mid brilliance that gives a serious bite. They also last longer than any other kind I've tried in my 25yrs of playing. I love the balance that's offered in the gauge span, super comfortable to play. For reference, I'm tuned g#d#g#c#f#a#d# on a 98' rg7620, and the 11-58 set is perfect for me, some extra give especially on the bottom end, which I prefer as a dynamic bendy player.
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Top reviews from the United States

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Patrick
5.0 out of 5 stars Not just snake-oil.
Reviewed in the United States on July 3, 2018
Color: Skinny Top Heavy Bottom (10-62)Verified Purchase
All comparisons/descriptions are in the context of my guitar (alder body, maple/pau ferro neck with SS frets, hard-tail bridge). I've been using Stringjoy strings for a while now (freaking fantastic by the way, as customizable as you could want gauge-wise) which are very full and lively (lots of harmonics, plenty of mids and they feel amazing for strings made of standard materials). The Cobalts, by direct comparison, have a lot less mids, around the same amount of low end and a bit more presence on top. They jangle very well and would be great for a guitar/pickups that are a little clogged up in the midrange. The set I normally use has gauges very close to this set of cobalts, but the cobalts feel a bit more loose than I would have expected (a few reviews I read stated that, when questioned, the folks at EB said that they're made with a slightly smaller core wire and that's fairly easy to see when inspecting the ball end during installation). They feel a bit rougher than what I'm used to, but they aren't uncomfortable by any means. I feel the greatest strength of this material is just how controlled/quiet they sound. Not just because of the slight scoop in the mids, but I don't hear the strings ring between the nut and tuners at all. Compared to standard slinkys and paradigms the cobalts are far and away my favorite. I'll be switching back to my Stringjoys in 10-14 days, but these are great strings that I could see many applications for.
4 people found this helpful
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D
5.0 out of 5 stars Amazing strings!
Reviewed in the United States on October 18, 2023
Color: Regular (10-56)Verified Purchase
These have clean solid tones, I’m definitely impressed!
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M&N
5.0 out of 5 stars The difference is night and day. Amazing strings.
Reviewed in the United States on June 8, 2021
Color: Power (11-58)Verified Purchase
Look, I don't leave reviews. It's usually a waste of time to me, but I had to leave one for these strings. Let me just say. Wow! Truly. Whatever strings I had before, are complete trash compared to these. I recently got an Ibanez 7-string, and I love it. But something about the sound was just...off. Heck, I even started looking at new pickups to buy! Then these came in. Strung em up, not thinking anything outside of it being time to replace my strings. Then I go to play. And (In Joe dirt voice) DANG!! The sound is so clear and vibrant!! 110% difference! I never would have thought that strings could make such a difference with the sound. It blew my mind. 100% recommend. No joke. If you own a 7-string, these are the strings to get.
2 people found this helpful
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Nikolas Bridges
5.0 out of 5 stars The best 7 string guitar strings!
Reviewed in the United States on April 2, 2023
Color: Skinny Top Heavy Bottom (10-62)Verified Purchase
If you like low tunings for a 7 string then these are for you! These strings are amazing! They sound great for jamming metal! My dad has been playing the guitar since he was a kid and he says these are the best strings he has ever played with! Definitely gonna be buying more!
One person found this helpful
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Luca Monforte
5.0 out of 5 stars Started having issues with nickel sensitivity and these helped a lot
Reviewed in the United States on October 13, 2023
Color: Skinny Top Heavy Bottom (10-62)Verified Purchase
I didn't get these looking for increased output or anything like that. On tour this summer I started having issues with my fingers, between heat, road conditions and a ton of hand sanitizer but finger tips kept getting this weird rash. On a break I basically only played my nylon and it immediately went away. I think for some reason the conditions caused me to be sensitive to nickel. I switched to these and it hasn't been back since. They're brighter than nickel at first, it kind of reminds me of the tone metal bass players get by always using new strings. But we just tweaked my high mid gain and it sounded normal. I'm going to switch back to my regular strings now that I'm home but I'll keep some sets of these around in case.
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Jace Morse
4.0 out of 5 stars Good strings
Reviewed in the United States on May 3, 2024
Color: Skinny Top Heavy Bottom (10-62)Verified Purchase
I like the combination of light top and heavy bottom strings, the sound great for heavier music
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Juan Pablo Jaramillo
5.0 out of 5 stars Super geniales
Reviewed in the United States on January 19, 2024
Color: Skinny Top Heavy Bottom (10-62)Verified Purchase
Resisten mucho la corrosión, suenan muy bien, qué más querés saber? Compralas, valen la pena.
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Patricia Nolasco
5.0 out of 5 stars Good strings
Reviewed in the United States on December 8, 2023
Color: Regular (10-56)Verified Purchase
Really good strings love the way they sound!
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Top reviews from other countries

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Polo Glz
5.0 out of 5 stars Buena calidad y precio
Reviewed in Mexico on July 23, 2023
Color: Skinny Top Heavy Bottom (10-62)Verified Purchase
Funcionalidad y calidad de sonido óptima
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Donald Ross
5.0 out of 5 stars Amazing!
Reviewed in Canada on April 29, 2022
Color: Skinny Top Heavy Bottom (10-62)Verified Purchase
Insanely fast shipping and I love the guitar strings. I will be ordering from this seller again for sure! :)
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🤘🏻😎🤘🏻
5.0 out of 5 stars Cuerdas de calidad
Reviewed in Spain on April 5, 2024
Color: Skinny Top Heavy Bottom (10-62)Verified Purchase
Mantienen muy buena tensión en afinaciones bajas, las recomiendo.
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A J MUMFORD
5.0 out of 5 stars Wow!
Reviewed in the United Kingdom on February 8, 2024
Color: Skinny Top Heavy Bottom (10-62)Verified Purchase
What a set of strings! Playability is top notch and sound is crisp and clear. Taken my 7 string to the next level
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Serg Linke
5.0 out of 5 stars Super
Reviewed in Germany on November 19, 2023
Color: Skinny Top Heavy Bottom (10-62)Verified Purchase
Alles super
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