Ernie Ball 2815 Extra Slinky Flatwound Bass Guitar Strings

Ernie Ball 2815 Extra Slinky Flatwound Bass Guitar Strings
Product no: 9000-0017-7949 Bax Music Warranty: This product comes with a manufacturing defects warranty.

General

The first ever flatwound strings to feature a cobalt core and matching winding, this pack of Ernie Ball 2815 Extra Slinky Flatwound Bass strings aren't just built to last way longer, but boast the smooth feel of a set of flatwounds and the direct sound of a set of roundwounds. The mega-light, .040 to .095 gauge, meanwhile, retains full tone and low, flexible tension alongside that classic, Slinky-grade playability.

Ernie Ball Cobalt Slinky Strings

The use of cobalt also boosts the magnetic attraction between the pickups and strings to guarantee an incomparable dynamic range, excellent overtone response, a potent bottom-end, and excellent high-end clarity. These strings also come in an airtight pack so they sound as fresh as they did the day they were born.

Ernie Ball String Packaging

Ernie Ball strings come sealed up inside an airtight pack to prevent oxidisation and to ensure that every string is as fresh as the day it was born.

Specifications

Product features

Number of strings	4
Sustainable product	not specified
String material	cobalt
Winding	flatwound
Scale length	long scale
Set / individual	1 set
Individual string gauge	not applicable
String gauges	.040 - .095
Taper-wound	no
Tone individual bass guitar string	not applicable
With coating	no

Weight and dimensions including packaging

Weight (incl. packaging)	300 gr
Dimensions (incl. packaging)	20,0 x 16,0 x 2,0 cm

Product specifications

pack of 4 strings
for electric bass guitar
Cobalt: clear, dynamic, rich and durable
Extra: thinnest version
gauges: .040 - .060 - .070 - .095

Write a review

sifi2112 March 27, 2026

Wrote the following about Ernie Ball 2815 Extra Slinky Flatwound Bass Guitar Strings

Nicest flatwounds I’ve found so far (got some Thomastik as well which are also nice) got a bit of roundwound twang/bite so more like what I normally use. If they last considerably longer than ss rounds I’ll be happy & price is best I could find as well :)