Nickel Plated Steel wrapped onto a hex core for exceptional tone and durability, nothing lasts longer! Over the last forty years virtually every vicious solo, every amazing rhythm part has been played on either a Fender Stratocaster or a Gibson Les Paul that was strung up with a set of Nickel Plated Steel strings . . . that's just a fact! Our Memphis Electric Strings are every bit as good as the best stuff out there and they're priced low enough for you to have fresh strings on your guitar whenever you choose.In enough gauges to please everyone.