Ernie Ball 2723 Cobalt Super Slinky Electric Strings

.009-.042 Electric Guitar Strings - Cobalt
Ernie Ball 2723 Cobalt Super Slinky Electric Strings image 1
Ernie Ball 2723 Cobalt Super Slinky Electric Strings image 1
Sweetwater Savings: $9.06 MSRP: $19.05

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Ernie Ball 2723 Cobalt Super Slinky Electric Strings
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Next-gen Guitar Strings

Ernie Ball Cobalt guitar strings are made of a new alloy formulation that gives you higher output, better sound, and longer life. Cobalt strings' special iron/cobalt blend attracts the magnets in your pickups better than any other alloy. When you string up with Ernie Ball Cobalts, you'll immediately notice the incredible comfort these strings offer - silky and pliable under your fretting fingers; your pick will seem to glide over the strings, letting you execute fast passages effortlessly. And when you plug in, you'll get increased power, beefy yet defined lows, improved midrange focus, harmonics, and sustain, and crisp highs. Try a set of Ernie Ball Cobalt strings - you're gonna love 'em!

Ernie Ball Cobalt Guitar Strings at a Glance:
  • Beta tested by the creme de la creme
  • Cobalt formula gives you higher output and better sound
  • Cobalts last longer
Beta tested by the creme de la creme

In the development of their Cobalt strings, Ernie Ball tapped select members of their star-studded artist roster - including Steve Morse, John Petrucci, Randy Jackson, Tony Levin, and Slash - to be beta testers for the new formulation. John Petrucci reported that the Cobalts sound "amazing," with "increased power, incredible clarity, and incredible sonic balance." He noted that the Cobalts seem "softer" under your fretting fingers (the term he used was "buttery"). Slash noted that - before being plugged in - the Cobalts "have an entirely different feel than normal strings." He goes on to characterize this sensation as "bouncy and pliable," and "a lot of fun for bending." When amplified, Slash commented that the Cobalts were just as bright as titanium strings, but more "guttural," with more "growl to them."

Cobalt formula gives you higher output and better sound

A half century ago, Ernie Ball practically invented "rock" guitar strings. And now, with Cobalt, they've re-invented them. After exhaustive testing of over 350 alloy combinations, the company ended up with an optimal formula that - as compared with conventional strings - gives you higher output, beefier lows with increased definition, improved midrange focus, shimmering harmonics and more robust sustain. You get a brighter sound without inducing harshness by turning up the treble on your amp.

Cobalts last longer

Ernie Ball Cobalt guitar strings last longer, retaining their brightness long after other strings have given up the ghost. Steve Morse reported having a set on one of his guitars "for several weeks," and with daily use - "sweaty hands" and all - the Cobalts "still sound bright... They just don't have that dead sound," he says. So, with higher output, better sound, and the monetary benefits of not having to change strings so often, Cobalts have it all over traditional alloy formulations. Check out a set of Ernie Ball Cobalt strings - you'll love 'em!

Ernie Ball Cobalt Guitar Strings Features:
  • Punchier, higher output strings
  • Beefier lows, with increased definition and growl
  • Increased midrange focus, harmonics, and sustain
  • Longer-lasting than conventional strings
  • .009, .011, .016, .024, .032, .042
  • Made in USA
Try the strings the pros ar raving about: Ernie Ball Cobalt guitar strings

Tech Specs

Guitar Type Electric
Number of Sets 1
Coated No
Gauges .009, .011, .016, .024, .032, .042
Core Material Steel
Winding Material Iron/cobalt alloy
Winding Type Round
Manufacturer Part Number P02723

Customer Reviews

Based on 9 reviews
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Amazing string! no hype

I've been a guitarist for over 40 years. I was a huge Dean Markley ultra lights guy for a long time until I made the switch to Ernie Ball Super Slinky's in the late 70's. From time to time, I've tried others just to check them out. Always ran back to Super Slinky's. I tried the Cobalt Super Slinky's a few months ago very warily and skeptically. Man, was I impressed! I've swapped all my guitars to these strings and won't go back! They are louder and "punchier". The notes are clearer and cut through the mix. They are easy on the fingers and last a LONG time. I'm all over the place on genres from Hendrix to Breaking Benjamin and my primary guitars are (all American) Les Paul Custom, Explorer, SSH Stratocaster, and Deluxe Telecaster. There was a very noticeable positive difference on every guitar. If you pay attention to your tone (and you should), the difference is well worth the extra dollars!
Music background: Semi retired semi pro guitarist

EB Cobalt strings

Great strings! I had a set on my Parker Fly for almost 6 months.
Music background: Pro musician,54 years experience. Toured US & Europe.

Love m

After reading all the hype I decided to try a set of, Ernie Ball Slinky Cobalt strings on my 02 Jackson DKMG. The Slinky Cobalt strings changed the voice of my guitar, richer, fuller, more body, and will handle higher bending of the strings without brakeage. So smooth fingers glide over these strings. I have ben using E.B. Slinky Cobalt strings for four months on same guitar, and the tone is still great. Only one con, if you like shiny strings buy nickel. I LOVE M.
Music background: Hobbyist

Good strings...

Put these on a new Tele. I normally use 10's but thought I'd give them a try before I had to change the set-up. I think these strings actually sound and feel like 10's to me. I know all strings are different according to your tastes and feel, but I really think I will keep these around awhile and not change to 10's yet. Can't really comment to the output difference claimed, but for me it's all about the feel and tone, which I like so far. I will report again as these strings get played a little more as this Tele is not my main guitar.

Worth the investment

These strings arrived yesterday and I can say I am genuinely impressed. Usually I think of products like this to be pure hype and marketing, but these things are definitely not. Probably the best part of them is that they entirely eliminate a muddy and booming low end, these are very clear and focused, and makes it have almost an acoustic fullness to them even with 9s when playing clean (I use an SSS Strat); and with the overdrive on they are never booming and very pleasant to listen to. I like the feel of these strings however apart from slightly easier bending they feel the same as normal slinkys, which is nothing to complain about. I can't say much yet on durability and life but will update my review when I can. These are a bit pricy, and Sweetwater was great as always.
Music background: Hobbyist, lead guitarist in band
See also: Electric Strings, Ernie Ball, Ernie Ball Electric Guitar Strings