Phosphor Bronze Features D'Addario's most popular acoustic guitar strings. Preferred for their warm, bright, and well balanced acoustic tone. Versatile enough for all musical genres. Made in the U.S.A. for the highest quality and performance. D'Addario's most popular acoustic guitar string set Preferred for its warm, bright, and well balanced acoustic tone Buy three sets and save with this environmentally friendly, corrosion resistant 3-pack Made in the U.S.A. for the highest quality and performance String Gauges: Plain Steel .012, .016, Phosphor Bronze Wound .024, .032, .042, .053 Happy bidding!