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Ernie Ball 2733 Hybrid Slinky Cobalt Electric Bass Guitar Strings - .045-.105

.045-.105 4-string Electric Bass Strings - Cobalt
8 Write review Item ID: EB2733
$34.99

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Ernie Ball 2733 Hybrid Slinky Cobalt Electric Bass Guitar Strings - .045-.105
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Next-gen Bass Strings

Ernie Ball Cobalt bass 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 fingers 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 4-string Bass Strings Features:
  • Punchier, higher output strings
  • Beefier lows, with increased definition and growl
  • Increased midrange focus, harmonics, and sustain
  • Longer-lasting than conventional strings
  • .045, .065, .085, .105
  • Made in USA
Try the strings the pros are raving about: Ernie Ball Cobalt bass strings
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Tech Specs

  • Guitar Type: Electric Bass
  • Number of Strings: 4
  • Coated: No
  • Gauges: .045, .065, .085, .105
  • Winding Type: Round Wound
  • Core Material: Steel
  • Winding Material: Iron/Cobalt Alloy
  • Scale Length: Long
  • Manufacturer Part Number: P02733

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Customer Reviews

4.6 out of 5

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Awesome Strings

These strings sound awesome, they have a brightness to them that sticks around for a fair amount of time. Just fantastic tone
by Sweetwater Customer on
Music background: Hobby Bass and Guitar Player

Rock on.

In my opinion these are some some of the best stings on the market and at a fair price. The sound is so crunchy I love it.
by Ty from Dolores, CO on

These strings ring and growl

I have to agree with the other reviewer Brandon about these strings. I have these strings on a PRS and a Reverse Jaguar. These strings KICK ***!!!
by Michael Stone from Vermont on

TL;DR: Rotosounds on 'Roids.

I like my bass to sound super-pronounced, and these strings DEFINITELY do the job! I put them on as soon as I got them so I could see if my gamble would pay off, and it was smiles-for-miles all evening.

I had an idea as to what to expect from a product demo I saw on YouTube with a Squier Jazz Bass. Compared to the Rotosound Swing Bass 66 set I had on there beforehand, there is a marked difference from what I remember hearing when I first put on the new Rotos. With the Rotos, the tone was very bell-like to begin with. With the Cobalts, the tone is a lot brighter, broader and more aggressive--on top of what was already established with the Rotos.

For context, I've got a 2016 American Professional Jazz Bass. Neck pickup is at 100%, bridge and tone knobs at 50%. I was using a Line 6 Firehawk FX, amp being a Marshall Super Bass 100 on a 4x12 Green Cab. EQ'd with lows at about 160hz (9 dB), low mids around 420 Hz (10.4 dB), high mids around 4.4 kHz (6.8 dB) and highs at 6.1 kHz (5.1 dB). Compression was at a -43dB threshold at 10 dB gain.

Even with the tone knob dialed back to half, I was able to get a highly-aggressive sound that I like. The sound was a lot more even, as well. My pickups were a lot clearer, the trebles were just as pronounced and the bass had a lot more weight to it than I ever remember before.

The feel compared to the Rotosounds is just about the same. I was expecting something slick like the stock, nickel D'Addario/Fender strings that come on Fender-family basses. The feel was comparable to the Rotosound strings (a little rough, but nothing crazy), so I can say I liked them. (I never was terribly crazy about slicker strings for whatever reason. Felt like they dug into my fingers more.)

Based on what I got out of these thus far, I think I've switched brands. I liked the Rotos, but these feel like a more balanced, amplified upgrade on the original recipe. I'm going to be buying another set in a couple months. (Maybe later if they're long-lived.) If you like your roundwounds to make your guitar sound like a howitzer, these should be your next buy.
by Brandon Lyall from Grundy, VA on
Music background: Bass Guitarist, Worship Musician

Cobalt slinky bass strings

This is my second review for these strings. I can't even begin to tell you how happy I am with these strings! I have been using these strings for a few years now on a couple of my main basses. They have great growl to them, they last a long time. I change them about every four months. I practice almost every day four two hours plus gigging . There has been a lot of hype over these strings and it's all true. The only thing is they zing a bit, but that to me is minor. The strings are also more powerful, louder and the E string doesn't get all flubbery or muddy on the open E. They stay in tune very well too. I won't use any other strings on my main basses because I already have and hated the the other strings I've tried. These strings are worth trying. Thanks Ernie Ball and Marcos Sanchez for being the best!
by Michael Stone from Vermont on
Music background: Weekend worrier
See also: Bass Strings, Ernie Ball, Ernie Ball Bass Guitar Strings
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