D'Addario EXP10 with NY Steel Acoustic Guitar Strings, 80/20, Coated, Extra Light, 10-47 Extra light gauging for playing ease Extra-bright tone mixed with deep and projecting bottom end, EXP Coated for 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, Bronze Wound .023, .030, .039, .047