HYBRID SLINKY CLASSIC ROCK N ROLL PURE NICKEL WRAP ELECTRIC GUITAR STRINGS - 9-46 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 .009, .011, .016, .026, .036, .046