Ernie Ball Nickel Wound Electric Bass Strings are made from nickel plated steel wrapped around a hex shaped steel core wire. Each bass guitar string produces a bright, balanced tone and manufactured with the finest and freshest raw materials in the beautiful Coachella Valley of Southern California. Gauges .040, .060, .075, .095 .125. Features: Nickel wound 6-string electric bass strings Made from nickel plated steel wrapped around a hex shaped steel core wire Produces a bright, balanced tone Manufactured with the finest and freshest raw materials