Ernie Ball 2720 Cobalt Power Slinky Electric Strings

.011-.048 Electric Guitar Strings - Cobalt
Ernie Ball 2720 Cobalt Power Slinky Electric Strings image 1
Ernie Ball 2720 Cobalt Power Slinky Electric Strings image 1
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Ernie Ball 2720 Cobalt Power 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
  • .011, .014, .018, .028, .038, .048
  • 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 .011, .014, .018, .028, .038, .048
Core Material Steel
Winding Material Iron/cobalt alloy
Winding Type Round
Manufacturer Part Number P02720

Customer Reviews

Based on 6 reviews
Write your review

New Fav!

I have been using EB strings for quite some time. I've always used the 1148 set on my LP and 1046 set on my Strat. Mostly, I'd go with the regular nickel wound. I've tried a few sets of RPS and Pure Nickel Wound series and I have to say they are all very good strings, but they are not that good for me to stick with them. I had the idea of trying out these new strings because the other guitar player, who plays an SG, in my band sounds so much brighter and more present than me and we were using the exact same rigs. I knew they claim the Cobalt series would give more output and make the sound brighter so I thought I'd give it a try. I ordered only one set because this is almost twice the price of the normal EB sets to try it out. The first impression is that the lower 3 strings provides more friction to the left hand than the regular EBs do, which is great for me. This is even better when I got on the stage because my hands sweat. I used to like the sound of a set of new strings but it would take a couple of days for the string to get comfortable to play. The Cobalt provides the great feel straight out of the box. As far as the tone goes, there's absolutely nothing wrong with it! It does seems to provide a little higher output. The tension seems to be a little greater than that of the regular EBs with the same gauge. But I do find that it's gradually losing its tension after 2-3 weeks of playing (which is quite normal). The string last quite long. I ordered 5 packs from Sweetwater after I tried the set. Will stick with these for some time! \m/ \m/
Music background: Gigging guitarist

My new strings!

Strung my guitar and didn’t notice a huge difference acoustically. When I plugged in I was very happy. These strings do what they claim. They add great focus and clarity. I had some issues with low end “Mud” but not anymore. They sound great, play great and have great tuning stability. If your trying to clear up your low end give these a try. Changing strings is easier, and cheaper, than hunting for new pick-ups, guitars or amps.


These are my new go to guitar strings. I play in C tuning, and these tones really help give those lower notes clarity and punch. These strings almost give the guitar tone a compressed sound. Would recommend to anyone.
Music background: Hobbyist

So far, so good

I wanted to dedicate one of my guitars to lower tunings, and the Power Slinky's fit the bill. I can tune down to Drop C tuning and still keep stability and tone at a premium, and still have the ability to bend and play with comfort. I didn't want a super high gauge, and with these, I'm happy so far. Still getting used to them on this guitar.

Initial Impressions

I tried the Cobalt Slinkys .011 - .048's on a Gretsch with a Bigsby through a Fender Blues Jr and also on a Swart AST . The sound really was different from the regular EB's . Definitely louder, perhaps harmonically richer, seemed to have a bit more clarity but I didn't set up a science experiment to confirm. The feel is different too. Especially on the wound strings. It didn't take too long to get used to and in time I may come to prefer it . I'm looking forward to trying them on my other electrics and seeing how long the life span is. It was worth the price just to satisfy my curiosity about them and I expect to continue using them.
Music background: Pro guitarist
See also: Electric Strings, Ernie Ball, Ernie Ball Electric Guitar Strings