Designed and gauged for "High Strung" or "Nashville" tuning methods / Phosphor Bronze, 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 .010, .014, .009, .012, .018. Phosphor Bronze Wound .027 /