From Ernie Ball:
Ernie Ball Nickel Wound Super Long Scale 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. Designed to fit 35″ scale basses, the string length is 50″ with a taper at 38 1/2″. Gauges .045, .065, .085, .105, .130