MOST POPULAR – Pursue your passion with D’Addario’s most popular acoustic guitar string set, the Phosphor Bronze Acoustic Guitar Strings. Since 1974, phosphor strings have been known for superb, long lasting tone and comfortable playability. They are the choice of professionals worldwide. INSPIRING PERFORMANCE – These light acoustic guitar strings help you achieve amazing performances, as they offer a long lasting, warm, bright and balanced acoustic tone with excellent intonation. CORROSION-RESISTANT – These strings feature a precision wound corrosion resistant phosphor bronze wire that is carefully drawn around a hexagonally shaped, high-carbon steel core. The result is consistent, long lasting tone. STRING GAUGES – The string gauges in this acoustic string set include: Plain Steel .012, .016, Phosphor Bronze Wound .024, .032, .042, .053. MADE IN THE USA – D’Addario leverages centuries of string-making experience and advanced computer-controlled winding technology to bring you the most durable, consistent and long-lasting guitar strings. Made in the USA for the highest quality and performance, only D’Addario strings are sealed inside and out.