Gauges 45-65-85-105. Ernie Ball 2843 Hybrid Slinky Bass Strings are crafted from stainless steel wire wrapped around tin plated hex shaped steel core wire. Produces well balanced, all around good sound. The list of endorsers for Ernie Ball Slinky bass strings reads like a who"s who of modern rock bass. Made in the USA with specially formulated alloys for long life and maximum vibrancy. Ernie Ball is the pioneer of rock and roll guitar strings. Jimmy Page, Eric Clapton, Steve Vai, and Slash are among the long list of Slinky players.