D'Addario's most popular acoustic set, EXP16 delivers the ideal balance of volume, projection and comfortable playability. D'Addario's most popular acoustic guitar string gauge, known for its superb, long-lasting tone and comfortable playability. EXP Coated phosphor bronze for warm, bright, well balanced acoustic tone and 4 times more life. 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 • Plain Steel .016 • Phosphor Bronze Wound .024 • Phosphor Bronze Wound .032 • Phosphor Bronze Wound .042 • Phosphor Bronze Wound .053