Ernie Ball Nickel Wound Electric Guitar Strings are made from nickel plated steel wire wrapped around tin plated hex shaped steel core wire. The plain strings are made of specially tempered tin plated high carbon steel producing a well balanced tone for your guitar. This combination is perfect for players who are looking for added playability with minimal differences in tone and tension to the Super Slinky strings. Gauges .008, .011, .014, .024w, .032, .042.