A D'Addario hybrid gauge, combining medium bottom strings with light top strings for a big sound with comfortable playability / Preferred for its warm, bright, and well balanced acoustic tone / Environmentally friendly, corrosion resistant packaging for strings that are always fresh / Made in the U.S.A. for the highest quality and performance / String Gauges: Plain Steel .012, .016, Phosphor Bronze Wound .025, .035, .045, .056 /