D'Addario EXP15 with NY Steel Phosphor Bronze Acoustic Guitar Strings, Coated, Extra Light, 10-47 D'Addario's lightest gauge acoustic guitar string set, known for its superb, long-lasting tone and playing ease EXP Coated phosphor bronze for warm, bright, well balanced acoustic tone and 4 times more life Includes DAddarios exclusive NY Steel, the same high carbon steel found in the NYXL series for unprecedented strength and pitch stability. Environmentally friendly, corrosion resistant packaging for strings that are always fresh String Gauges: Plain Steel .010, .014, Phosphor Bronze Wound .023, .030, .039, .047