Ernie Ball Cobalt 7-String Skinny Top Heavy Bottom Electric Guitar Strings

Discover a different voice for your guitar with these Colbalt strings from Ernie Ball. The cobalt formula provides increased dynamic range with more low end.

Seeking to provide guitarists and bassists with a new voice, Cobalt strings provide an extended dynamic range, incredible harmonic response, increased low end, and crisp, clear highs. Cobalt provides a stronger magnetic relationship between pickups and strings than any other alloy previously available. Cobalt Slinkys are also soft and silky to the touch, making string bending a breeze.


- Cobalt attracts the magnets in your pickups more than any other alloy available.
- Enhanced output.
- Incredible harmonic response.
- Increased low end.
- Crisp, clear highs.
- Tin plated high carbon steel core.
- Element shield packaging prolongs string life and keeps strings as fresh as the day they were made.
- Crafted in Southern California, USA. Featuring the finest and freshest materials.
WARNING: Cancer and Reproductive Harm -

- Gauges: .010, .013, .017, .030, .042, .052, .062.
Dimensions and Weight in Packaging
Base Item
Shipping Weight: 0.11 lbs
Shipping Dimensions: 5 x 4 x 1 in
Manufacturer Part Number (MPN): P02730

For support or warranty questions, please contact the manufacturer:
Phone: 800-543-2255

Reviewers gave this product an overall rating of 5 out of 5 stars. (2 ratings)
Submitted May 26, 2019 by Brad H in Wichita Falls, TX


Overall: 5 out of 5 stars
(see rating details)
Verified Customer zZounds has verified that this reviewer made a purchase from us.
Use these exclusively on my 7 string. Perfect gauge sizing for down tuning; I love tuning to GDGCFAD. As far as "output" I can't really discern any advantage over other strings, but these of course have that great bouncy Ernie ball sound to them. I feel like they last a tad longer than plain Ernie balls but it could be a placebo effect. The gauge is perfect for what I do, anything else with these is just a plus. My main motivator to choosing strings are the available gauges, and these are a perfect fit. If you're looking in this range, you won't be disappointed.

Musical Background:

15+ years, various bands and gigs

Musical Style:

Hard Rock, Metal, prog.
1 of 1 people (100%) people found this review helpful. Did you?
Thanks for your opinion!


FREE -Day Shipping!
Get it  for
Get it by if you order within
Shipping to