D'Addario Phosphor Bronze EXP Acoustic Guitar Strings LT 12-53 EXP16-2 Packs Light String Gauges: Plain Steel .012, .016, Phosphor Bronze Wound .024, .032, .042, .053 Made in the U.S.A. for the highest quality and performance Environmentally friendly, corrosion resistant packaging for strings that are always fresh EXP Coated phosphor bronze for warm, bright, well balanced acoustic tone and 4 times more life D'Addario's most popular acoustic guitar string gauge, known for its superb, long-lasting tone and comfortable playability