D'Addario EJ21 Nickel Wound Electric Guitar Strings, Jazz Light, 12-52 Features a wound 3rd/G string, optimal for "jazz" style playing Round wound with nickelplated steel for distinctive bright tone String Gauges; Plain steel .012, .016, Nickel Wound .024, .032, .042, .052 Corrosion resistant packaging for fresh strings, always! Made in the U.S.A. for the highest quality and performance