POWER SLINKY CLASSIC ROCK N ROLL PURE NICKEL WRAP ELECTRIC GUITAR STRINGS - 11-48 GAUGE ERNIE BALL SLINKY CLASSIC ROCK N ROLL PURE NICKEL WRAP ELECTRIC GUITAR STRINGS ARE MADE FROM PURE NICKEL WIRE WRAPPED AROUND TIN PLATED HEX SHAPED STEEL CORE WIRE, THESE GUITAR STRINGS PRODUCE A WARM RICH TONE WITH THAT SIGNATURE SLINKY FEEL. GAUGES .011, .014, .018P, .028, .038, .048