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Ernie Ball 2721 Cobalt Regular Slinky Electric Guitar Strings 

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Ernie Ball 2721 Cobalt Regular Slinky Electric Guitar Strings are a new spin on Ernie Ball's best selling set of strings which have been played by th...Click To Read More About This Product

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OVERVIEW

Play like a pro with these revamped classics.

Ernie Ball 2721 Cobalt Regular Slinky Electric Guitar Strings are a new spin on Ernie Ball's best selling set of strings which have been played by the likes of Eric Clapton, John Mayer, Steve Vai and many more. The Cobalt Series is clearly an improvement on its classic nickel-wound counterpart giving the player increased sustain, clarity and output. In addition, they resist sweat and moisture better and have unmatched flexibility when compared to other nickel wound strings. Cobalt is the most magnetically active string alloy on the planet and attracts the magnets in your pickups more than any other string.

"Ernie Ball Cobalt Strings sound and feel better than anything I've ever played! You have to check these out!" - Slash.
"Cobalt Strings feel incredibly silky under my fingers and deliver more punch, output, and clarity than normal strings!" - John Petrucci.

All Ernie Ball strings are precision manufactured to the highest standards and the most exacting specs to assure consistency, optimum performance and long life. Made in the USA.

Gauges 10-13-17-26-36-46.


Start hearing and feeling the Cobalt difference today. Order now!

Reviews
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Review Snapshot

by PowerReviews
Ernie Ball2721 Cobalt Regular Slinky Electric Guitar Strings
 
4.1

(based on 60 reviews)

Ratings Distribution

  • 5 Stars

     

    (35)

  • 4 Stars

     

    (9)

  • 3 Stars

     

    (10)

  • 2 Stars

     

    (1)

  • 1 Stars

     

    (5)

75%

of respondents would recommend this to a friend.

Pros

  • Good tone (37)
  • Well built / quality (27)
  • Consistent (26)
  • Long life (22)

Cons

  • Poor tone quality (5)
  • Not consistent (3)

Best Uses

  • Concerts (22)
  • Practicing (21)
  • Back-up (16)
    • Reviewer Profile:
    • Experienced (30), Professional musician (16)

Most Liked Positive Review

 

Love these strings... sustaining sounds I love...

Actually I am somewhere between Novice and Experienced. I had been using a variety of strings and was okay with a couple of brands. But then I tried these and I was surprised at...Read complete review

Actually I am somewhere between Novice and Experienced. I had been using a variety of strings and was okay with a couple of brands. But then I tried these and I was surprised at the sustain these gems had compared to the name brand strings I had been using. I love them. IF there are others I want to know, but these have sustain and clarity I hadn't been getting until now. Just wow.

VS

Most Liked Negative Review

 

Very different strings

I've been a D'Addario user for the last 10 years; however, I was curious about the new Cobalt strings introduced by EB, because no other string manufacture ever marketed strings made from this...Read complete review

I've been a D'Addario user for the last 10 years; however, I was curious about the new Cobalt strings introduced by EB, because no other string manufacture ever marketed strings made from this metal. When these new EB Cobalt strings were placed on my Fender Highway 1 HSS Strat, I noticed the guitar had much greater dynamics, volume, sustain and tone compared to the regular D'Addario 10-46 used in the past. Even when strumming the electric unplugged, you can definitely feel the energy of the sustain, and hear the dynamics of the individual notes clearly. These traits were also experienced with the guitar being amplified clean and dirty. Because of the strings clearity, you will hear all the nuiances of your playing. So if you play sloppily now, you hear that with these strings. But over time, your playing can become much more precise. As for feel, there seemed to be more drag when sliding. It wasn't as smooth as the D'Addarios. After 3 hours of playing, my fingertips were more chewed-up than playing with the DA's made from nickle. With that said, I also noticed that my guitar frets started to wear down quicker over the last year. Perhaps Cobalt is a harder element than Nickle??? As far as durabily is concerned... the plain strings started to tarnish after about 2 weeks, but tuning, tone, sustain, dynamics and volume were maintained. After about a year, I switched back to DA's because of the fret wear and draggy feel. I will try these on my guitars with stainless steel frets, but will not put them on my regular nickle alloy fretted guitars.

If EB can make these strings with less drag on my fingers, less wear on my frets and ant-tarnish, then that would more justify the price. Till then... I'm going back to D'Addarios.

Reviewed by 60 customers

Displaying reviews 1-10

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(5 of 5 customers found this review helpful)

 
5.0

Best Strings Ever Produced....

By Jamithome

from California

Comments about Ernie Ball 2721 Cobalt Regular Slinky Electric Guitar Strings:

I was a little skeptical, but these are by far the best strings I've ever played. I won't be using nickel any longer!
Just bought a few packs of these Cobalt Regular slinky strings and put them on my Strat and Les Paul, and I've never heard my guitars sound so good. The output and clarity, especially in the mid range is so much better than nickel. Great job EB.
Great strings, holding up well too!
Worth every penny in my opinion. My guitars finally have a new voice!

(4 of 4 customers found this review helpful)

 
5.0

creamy smooth overdrive on a thin gauge

By Swinging Richard

from Wichita, KS

About Me Professional Musician

See all my reviews

Ask me a question

Pros

  • Consistent
  • Fast Beautiful Od Tough
  • Good Tone
  • Long Life
  • Strong

Cons

  • None So Far Still Eval

Best Uses

  • My Go-to String

Comments about Ernie Ball 2721 Cobalt Regular Slinky Electric Guitar Strings:

I was disappointed when I went to my local shop and all they had were sets of 9's. I haven't played on anything less than 12's since I first picked up the guitar. Imagine my surprise when I got them on and it sounded like I had 14's on, yes they sounded that fat. After playing 12's for the past 3 decades my fingers were flying up and down the fret board like lightning posessed. Light, fast & they sound like they're fat enough to hang a truck on without breaking. I play a U.S. Telecaster through a Fender Blues Deville with 4x10's that is so clean that I have to be up around ear bleed volume to get even the slightest overdrive. These strings deliver something I thought I'd never accomplish without a series of OD pedals. Thanks Ernie Ball. What I will save in not having to keep buying OD pedals should set me up with enough strings to last the rest of my life.

(3 of 3 customers found this review helpful)

 
1.0

Rusty Rusty Rusty

By Guitarman

from Mankato MN

About Me Experienced

Comments about Ernie Ball 2721 Cobalt Regular Slinky Electric Guitar Strings:

I've been using Erine Ball Regular Slinky Nickel strings for 20 years and love them. I recently wanted to try the new cobalt strings on my Les Paul. The first set I used at home and at a few indoor gigs and was pretty happy. They weren't as bright as Regular Slinky's, but that was what I was going for with my Bluesy Mid rangy tone. I put a second set of cobalts on my les paul and played an outdoor gig in the summer time in MN and was so disapointed at how fast these cobalt strings corroded in the humidity. They were dead in one day of playing outside.... Sorry but I won't be buying cobalts anymore. Nickel forever!

(3 of 3 customers found this review helpful)

 
5.0

I probably won't switch brands again

By nhunter333

from Live Oak FL

About Me Professional Musician

See all my reviews

Ask me a question

Verified Buyer

Pros

  • Consistent
  • Good Tone
  • Long Life
  • Strong

Cons

  • A Little Pricey

Best Uses

  • Backup
  • Concerts
  • Everything
  • Practicing

Comments about Ernie Ball 2721 Cobalt Regular Slinky Electric Guitar Strings:

I have never used regular Ernie Ball slinkys so I cannot compare the two....With that being said, on to my review!
I tried these when they came out after using Elixer Nanowebs for years. The Cobalt EB's sound better to me and strength wise are just as durable. And they don't get "fuzzy" from a coating coming off that you don't need any way.
I practice 2 to 3 nights per week, and we play 4 to 6 shows per month (4 hours a night). I sometimes keep my axes in a case, and sometimes they may hang on a stand for a week. They don't rust and sound great..... I know I should change more often, but, I generally only change strings once a month.
They stretch out and break in quick, (like right before a show LOL), stay in tune, and, in the 2 years I've been using them I have not broken one
yet.
I play a Fender Strat, and a Jackson dinky with a Floyd Rose.

(3 of 4 customers found this review helpful)

 
3.0

Very different strings

By Letitrok

from Toronto, Ontario, Canada

About Me Experienced

Pros

  • Consistent
  • Good Tone
  • Strong

Cons

  • Hard On Fingers And Frets

Best Uses

  • Concerts
  • Practicing

Comments about Ernie Ball 2721 Cobalt Regular Slinky Electric Guitar Strings:

I've been a D'Addario user for the last 10 years; however, I was curious about the new Cobalt strings introduced by EB, because no other string manufacture ever marketed strings made from this metal. When these new EB Cobalt strings were placed on my Fender Highway 1 HSS Strat, I noticed the guitar had much greater dynamics, volume, sustain and tone compared to the regular D'Addario 10-46 used in the past. Even when strumming the electric unplugged, you can definitely feel the energy of the sustain, and hear the dynamics of the individual notes clearly. These traits were also experienced with the guitar being amplified clean and dirty. Because of the strings clearity, you will hear all the nuiances of your playing. So if you play sloppily now, you hear that with these strings. But over time, your playing can become much more precise. As for feel, there seemed to be more drag when sliding. It wasn't as smooth as the D'Addarios. After 3 hours of playing, my fingertips were more chewed-up than playing with the DA's made from nickle. With that said, I also noticed that my guitar frets started to wear down quicker over the last year. Perhaps Cobalt is a harder element than Nickle??? As far as durabily is concerned... the plain strings started to tarnish after about 2 weeks, but tuning, tone, sustain, dynamics and volume were maintained. After about a year, I switched back to DA's because of the fret wear and draggy feel. I will try these on my guitars with stainless steel frets, but will not put them on my regular nickle alloy fretted guitars.

If EB can make these strings with less drag on my fingers, less wear on my frets and ant-tarnish, then that would more justify the price. Till then... I'm going back to D'Addarios.

(3 of 3 customers found this review helpful)

 
4.0

Ernie Ball Regular Cobalt Slinky Electri

By Jake Hueller

from Lyons, OR

About Me Experienced

See all my reviews

Ask me a question

Pros

  • Good Tone
  • Long Life
  • Strong

Cons

  • Not Consistent

Best Uses

  • Backup
  • Concerts
  • Practicing

Comments about Ernie Ball 2721 Cobalt Regular Slinky Electric Guitar Strings:

I have used standard 10-gauge Slinkys ever since I first used an electric guitar. When I heard the comments on these things from Steve Vai, Steve Morse, Paul Gilbert, Slash, Steve Lukather, and of course, John Petrucci, I new I had to get some.
First off, the tone. Breathtaking! Clear, shimmery tone, and very clean and open sounds that ring forever. Sustain is great, and it does not go away easily.
Secondly, the feel. Honestly, the feel is pretty different. The winds are a little bit wider apart then standard strings, and this does make them a little more grimy feeling. There is more of a scratch when you slide up a not. That being said, these strings can last forever, and they actually do feel very good. The thing is, they feel very nice and silky most of the time. Recently, the packs I have gotten are just a little grittier for some reason. Also, they normally will feel very strange right out of the pack, and this is where you will find the squeaks and grimy feel. But in the many packs of Cobalts I've gone through, that goes away in a couple of days, and they feel very nice for months afterwards.
Overall, these are the best strings I've ever played. I will continue to use these for as long as I can. Be warned though; they do feel very different, sharp almost, straight out of the pack, but don't remove them. They will be much better in a couple of days.

(3 of 5 customers found this review helpful)

 
3.0

Too bright sounding to me

By Something Wicked's drummer

from West Virginia

See all my reviews

Comments about Ernie Ball 2721 Cobalt Regular Slinky Electric Guitar Strings:

I put these on an old ESP LTD MH-400 with EMG 81s.The stirng are way too bright to my ears. They almost sound harsh to my ears. I think they would sound much better on a guitar that has single coil pickups like a strat or a tele. They have a snappy, very very bright, bell-like tone to them. I personally perfer the sound of a nickel string. I would recommend trying them for yourself. You may like the way they sound on your guitar.
They do slightly increase the output of your guitar and give you sligh more clarity.
They seem to be holding up well. I have been playing them for a few days know and they are still and bright as when I first put them on.
They are too expensive for what you get. They are only a little bit better than nickel strings. In my opinion it is not worth paying twice as much.

(3 of 3 customers found this review helpful)

 
4.0

Worth a look

By jpmct

from Virginia, USA

See all my reviews

Comments about Ernie Ball 2721 Cobalt Regular Slinky Electric Guitar Strings:

They improve the tone of my Ibanez than I use for hard rock songs and they are fast and playable. They enhance the tone of the instrument. For a strat, they add treble and edge, so that's better if that is what you are looking for. You do lose a bit of the classic strat quack. For Les Paul's I don't like them. LP's are a dark guitar and it makes it sound different. If you are playing rock on the LP it would be fine, but if you are playing alternative or blues numbers I think it sounds worse, at least to my ear.
The use of a Cobalt alloy gives the strings different handling and magnetic properties that changes the feel and the tone of the product. This is certainly true. The strings have a smoother texture, are audible louder and change the tone of the guitar. The frequency response captures more high end and is is easier to achieve intentional harmonics. Sustain is improved, but I suspect this is merely because they are louder. It would be nice to have a bulk package as pulling them out of individual packages is a pain when you are trying to striing the instrument quickly on a workbench.
Packaging and pliability are fine. I can't comment on string life other than to say that that I have used them for three gigs in the past two weeks and they still sound new. This is no different than the D'Addario's that I usually use.
They are reasonalby priced.

(3 of 3 customers found this review helpful)

 
4.0

Cobalt Regular Slinky Electric Guitar Strings- by William D.Jones

By william jones

from Orlando, Florida

Comments about Ernie Ball 2721 Cobalt Regular Slinky Electric Guitar Strings:

i think these strings are a milestone in guitar history and think that these strings will go about for some time now wtih an ok price good feel, surprising new tone and overal satisfaction it seems to give you
Just got these today when i first opened then i first noticed totally new envolopes for strings. At first glance you couldn't really tell the difference from a normal nickelwound set until you feel them. they aren't as rough as normal and kinda remind you of presure wounds at least in my opinion.
To me it seemed like these were made for professinals and it gives you a professinal feeling.You tend to get more tone it seems from the low E A and D strings, and when playing i noticed that you could get harmonics from every fret, which i thought was cool not to mention the improved pinch harmonics that metal calls for.
i think Ernie ball made just the E A and D string from the alloy, which i think is kinda cheap but what ever it was an ok price i suppose, then again i had to test them for myself and the price wasn't that extraordinary

(3 of 5 customers found this review helpful)

 
4.0

Good but expensive

By Jonathan Martin

from Georgia

See all my reviews

Comments about Ernie Ball 2721 Cobalt Regular Slinky Electric Guitar Strings:

These cobalt strings do sound and feel better on my guitar than regular strings. My guitar has slightly more output and is more responsive with cobalt strings on it. My only problem with them is the price. It is hard for me to justify paying over twice as much for strings when the results aren't that different. Unless they lower the price a bit, I believe I will stick to normal strings for playing live or practice. The only time I would be tempted to use them again would be recording, where the difference might be more obvious.
They're stings, not many features they could put on them.
Can't complain about the quality at all. These strings feel very nice and I have no reason to doubt that they will last.
The price is just too high. I'm sure the r&d costs demanded a high price, but regular strings cost half as much without a huge loss in sound quality.

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