| D'Addario 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 Feature D’Addario’s exclusive New York manufactured, high carbon steel for unprecedented strength and pitch stability. | Environmentally friendly, corrosion resistant packaging for strings that are always fresh String Gauges: Plain Steel .012, .016, Phosphor Bronze Wound .024, .032, .042, .053 |