D'Addario EPN115 Pure Nickel Electric Guitar Strings, Blues/Jazz Rock, 11-48 Blues/Jazz Rock gauge Pure Nickel wrap wire delivers a warmer, vintage electric guitar tone Corrosion resistant packaging for strings that are always fresh Made in the U.S.A. for the highest quality and performance String Gauges: Plain Steel .011, .014, .018, Nickel Wound .027, .037, .048