| D'Addario most popular 12-string acoustic set. Optimized gauges for balanced 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 .010/.10, .014/.014, Phosphor Bronze Wound .023/.008(p), .030/.012(p), .039/.018(p), .047/.027(w) |