D'Addario is best for guitar strings, Addario Ez920 medium light acoustic guitar strings in phosphor bronze the string thicknesses Are 12, 16, 25, 34, 44, 54 One complete set of acoustic guitar strings medium light gauge (.012 -.054) wound strings are round wound, made from 85/15 bronze Unwound strings are plain steel strings packaged in corrosion intercept bags for guaranteed freshness made in USA Medium Light, ideal balance of tone, projection and playability, bright, long lasting acoustic tone, ideal for all musical styles 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, Bronze Wound .025, .034, .044, .054