D'Addario's most popular acoustic guitar string set, known for its superb, long-lasting tone and comfortable playability / Preferred for its warm, bright, and well balanced acoustic tone / Environmentally friendly, corrosion resistant packaging for strings that are always fresh / 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 /