Ernie Ball 2833 Hybrid Slinky Bass Guitar Strings are round-wound for maximum clarity and serious punch. 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. Gauges 45-65-85-105.