Pricing and availability

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Sweetwater
4.0 (21)
$11.99
Guitar Center
4.5 (58)
$11.99
Amazon
4.7 (2209)
$11.39
Reverb
5.0 (9)
$9.99 New
$14.99 Used
Musician's Friend
4.0 (32)
$11.99
zZounds
5.0 (6)
$11.99
Thomann
4.6 (293)
$11.70

Price History

Based on price data from 4 merchants for "Ernie Ball Super Slinky Cobalt Guitar Strings (9-42)". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

Discover the Ernie Ball Super Slinky Cobalt Guitar Strings (9-42), a revolutionary blend of sound and technology that's designed to amplify your playing experience. With a cobalt alloy, these strings are magnetically active, providing an output that's up to 40% more powerful than traditional nickel-plated steel strings. This results in rich, well-defined lows, clear mids, crisp highs, and harmonics that simply soar.

The cobalt blend is also known for its exceptional clarity, dynamics, and punch. Each note rings out with a bell-like clarity, allowing your guitar solos to shine and rhythm parts to resonate deeply. The cobalt alloy provides a stronger magnetic relationship with pickups, resulting in an extended dynamic range, incredible harmonic response, and robust low-end.

While these strings deliver power, they're also incredibly flexible under your fingers, resulting in a silky, smooth feel that allows for faster playing and effortless bends.

Not only are these strings highly responsive, but they're also long-lasting. The cobalt alloy is more resistant to moisture, sweat, and corrosion than traditional nickel-plated steel, ensuring your strings maintain tone and playability for an extended period.

Key Features:

  • Made of a cobalt alloy for unprecedented power, clarity, and sustain
  • Provides up to 40% more output than traditional nickel-plated steel strings
  • Precision engineered for maximum clarity, dynamics, and punch
  • Offers a silky, smooth feel for faster playing and effortless bends
  • Resistant to moisture, sweat, and corrosion, resulting in longer-lasting strings
  • Gauge: .009, .011, .016, .024, .032 and .042 for balanced tension
  • Made to the highest quality standards by Ernie Ball
  • Gives each note a bell-like clarity from the first fret to the last.

Product specs

Guitar Type Electric Guitar
Number of Strings 6
Coated No
Gauges .009, .011, .016, .024, .032, .042
Core Material Steel
Winding Material Iron/cobalt alloy
Winding Type Round Wound

FAQs

What makes Ernie Ball Super Slinky Cobalt Guitar Strings different from regular strings?

These strings use a unique iron/cobalt alloy for the winding material, which enhances output and clarity compared to traditional nickel-wound strings, providing a brighter and more dynamic tone.

Are Ernie Ball Super Slinky Cobalt strings suitable for all electric guitars?

Yes, these strings are designed for use with any standard electric guitar, offering versatile performance across various styles and genres.

How do the Ernie Ball Super Slinky Cobalt Guitar Strings affect playability?

The .009 to .042 gauge provides a light feel, making them easy to bend and play, which is ideal for fast playing styles or players who prefer lower tension.

Do Ernie Ball Super Slinky Cobalt strings last longer than regular strings?

While they are not coated, the cobalt alloy provides increased durability and resistance to corrosion compared to traditional strings, potentially extending their lifespan with regular care.

Can these strings enhance the sound of my guitar pickups?

Yes, the cobalt alloy is known to enhance magnetic properties, which can result in a stronger signal and more pronounced sound from your guitar pickups.

Ernie Ball

Ernie Ball

Slash Play Tests The New Ernie Ball Cobalt Electric Guitar Strings

Video thumbnail for Slash Play Tests The New Ernie Ball Cobalt Electric Guitar Strings by Ernie Ball

Slash Play Tests The New Ernie Ball Cobalt Electric Guitar Strings

Ernie Ball

Ernie Ball

Video thumbnail for John Petrucci Play Tests The New Ernie Ball Cobalt Electric Guitar Strings by Ernie Ball

John Petrucci Play Tests The New Ernie Ball Cobalt Electric Guitar Strings

Ernie Ball

Ernie Ball

Video thumbnail for Ernie Ball Electric Guitar Strings Comparison - The Ultimate Strings Demo! by Guitar World

Ernie Ball Electric Guitar Strings Comparison - The Ultimate Strings Demo!

Guitar World

Guitar World

Video thumbnail for Kenny Wayne Shepherd Play Tests The New Ernie Ball Cobalt Electric Guitar Strings by Ernie Ball

Kenny Wayne Shepherd Play Tests The New Ernie Ball Cobalt Electric Guitar Strings

Ernie Ball

Ernie Ball

Video thumbnail for Ernie Ball: Slinky, Cobalt, M-Steel, Paradigm: A 9-42 Taste Test! by Brett Kingman

Ernie Ball: Slinky, Cobalt, M-Steel, Paradigm: A 9-42 Taste Test!

Brett Kingman

Brett Kingman

Video thumbnail for Guitar String Shootout: Ernie Ball M-Steel 9-42 vs. Cobalt 9-42 & 8-38 Comparison Test by Barista Bear

Guitar String Shootout: Ernie Ball M-Steel 9-42 vs. Cobalt 9-42 & 8-38 Comparison Test

Barista Bear

Barista Bear

Reviews

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Ernie Ball Super Slinky Cobalt Guitar Strings (9-42).

User experience

  • Cobalt strings provide enhanced bend and vibrato control, allowing easier one-finger bends for players with strong fingers.

    Source
  • Cobalts offer grippy strings that aid precise sliding, allowing players to stop accurately without conscious slowing.

    Source
  • Cobalt strings can feel grainy, with noticeable friction when sliding.

    Source
  • Some users experience dermatitis with Cobalt strings, possibly due to cobalt allergies, although this is not universally reported.

    Source
  • High e-string breakage is less frequent for some users when switching to Super Slinkys, attributed to improved string installation and use of locking tuners.

    Source
  • Super Slinkys are favored by players who frequently change strings for live performances due to their quick break-in time and consistent tone.

    Source
  • Some users report better control and feel with Super Slinkys on Stratocasters and Telecasters, highlighting their suitability for bending and fretting.

    Source

Features and functionality

  • Cobalts make single coils sound fatter and punchier, enhancing tonal control via the picking hand.

    Source

Use cases and applications

  • Cobalts are favored by bass players for their brighter, punchier tone.

    Source
  • Cobalt strings are said to enhance the output of passive pickups, making them sound more robust, akin to active pickups.

    Source
  • Super Slinkys are praised for their sound on Fender-style guitars, particularly for players with a hard playing style, maintaining durability and tone.

    Source

Setup and maintenance

  • Owners note that Cobalt strings can cause accelerated fret wear on nickel silver frets; stainless steel frets are recommended to mitigate this issue.

    Source
  • Cobalt strings do not fare well in humid environments, with reports of rust and degradation in under two weeks in places like Hawaii.

    Source

Comparisons

  • Users transitioning from pure nickel EB strings to Cobalts report reduced fret buzz, suggesting a smoother transition for those experiencing similar issues.

    Source
  • Compared to D'Addario .11's, Cobalts are preferred for their fuller sound, though some users still prefer the feel of D'Addario strings.

    Source
  • Users transitioning from Power Slinkys to Super Slinkys on Stratocasters noticed easier bending and reduced fret pressure on longer scale guitars.

    Source
Add

5.0 out of 5

Based on 6 Reviews and 23 Ratings

5 star
4 star
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2 star
1 star
matt_kehley

Best Strings I've Ever Played

I've tried a ton of different strings when I was starting and felt the Ernie Ball Super Slinky's were the best fit for me. Then Ernie Ball upped their game with the Cobalt series. I only use Cobalts on my FSR Strat. The output goes up, string life goes through the roof, ability to play louder when unplugged, and superior tuning stability compared to other strings. They are more expensive, but they're worth it. Another thing is that they seem to get your fingers a little dirtier then regular Slinky's.

dmos
dmos

129

Superb strings

Put this on my Telecaster, and they feel great. Absolutely excellent strings. Might just be my imagination, but I think it affected the tone too. Definitely a good option.

meporter

Ernie Ball! Slinky Cobalt. Need I say more....

Cobalt 9/42. Great sound!! Same as my idol Angus Young!

woodyhumes

Love 'em

I used the .11 gauges and they are absolutely amazing. They feel great and sound great

diskovr

Awesome

These are some of the best strings ive ever heard on my guitar

Artist usage

Add artist
See how Steve Vai uses Ernie Ball Super Slinky Cobalt Guitar Strings (9-42)

Steve Vai

Guitarist

Whitesnake

...
Verified via YouTube

"I'm usually a 9-42 guy, and I think the seven-string is a 52. Some of the guitars are tuned down for songs like John the Revelator and Gravity Storm, so for those I use like 10s. Those songs are tuned down a whole step. So even with heavy strings they're kind of floppy. I've used Ernie Ball for years and years. They're a solid company, they're great people, and they just came out with these new strings called Cobalt. It's always been my feeling that strings are strings, how different can they be. So I put these strings on and at first I didn't like them. I thought they were weird. They really feel different - really slinky and pulling. Then I started using them and they just started feeling more the way a guitar should feel. So I really liked them... These strings, maybe it's not feel like a guitar should feel like, maybe they're more like what my zone feels like. They move more with my emotional input," says Steve Vai about the Ernie Ball Cobalt Super Slinky Electric Guitar Strings.

See how Jared Dines uses Ernie Ball Super Slinky Cobalt Guitar Strings (9-42)

Jared Dines

Singer, Guitarist

SION

...
Verified via YouTube

He shows it around the 2:50 mark

See how Sarah Lipstate uses Ernie Ball Super Slinky Cobalt Guitar Strings (9-42)

Sarah Lipstate

Guitarist

...
Verified via Photo

On Instagram, Sarah Lipstate shared a post featuring Ernie Ball Super Slinky Cobalt Guitar Strings (9-42), expressing interest in trying them out and highlighting their positive reputation.

See how Matthew Murphy uses Ernie Ball Super Slinky Cobalt Guitar Strings (9-42)

Matthew Murphy

Singer, Guitarist

The Wombats

...
Verified via Premierguitar

According to Premier Guitar's rig rundown, all of Murphy's guitars are stringed with Ernie Ball Cobalt Super Slinkys. (the gauge is .11.)

Genre Usage

Based on how artists on Equipboard use this gear, it is most commonly found in the following genres.

Used With

Based on how musicians on Equipboard use Ernie Ball Super Slinky Cobalt Guitar Strings (9-42), it is most commonly used with the following gear.

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