The wound Slinky strings have a nickel plated steel wrap wire around a hex shaped steel core. The non-wound high carbon steel treble strings are put through a specially tempered tin plating process to balance out the guitar's tone. All Ernie Ball strings have hermetically sealed foil packaging that defends your strings from humidity. You'll get fresh tone as if you pulled your Super Slinky strings straight from the Southern California, USA factory. Even better, the packaging insert labels are made from 100% recycled materials. String up your guitar with an Ernie Ball Super Slinky set and enjoy terrific tone and pleasant playability.
Try 'em. You'll see why countless players rely on Nickel Slinkys.