D'Addario EJ38H Phosphor Bronze Acoustic Guitar Strings, High Strung/Nashville Tuning, 10-27 Designed and gauged for "High Strung" or "Nashville" tuning methods Phosphor Bronze, preferred for its warm, bright, and well balanced acoustic tone 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