Guitar strings, Fender nickel-plated steel, ball end.009-.042 Original Fender 250s: The "high-octane" nickel plated steel string for your electric guitar With a pure steel wrap, the magnets in your pickups use the whole string, not just the core, and transform the energy into high output bursts of sound The nickel plating enhances feel while reducing "string squeak" and fret wear without compromising tone Original equipment on all U.S made Fender electric guitars