They combine the brilliance of 80/20 Bronze with the tonal characteristics of Phosphor Bronze.D’Addario is the world’s largest manufacturer of strings for musical instruments. Many top guitarists won’t play any other brand. Regardless of your playing style, D’Addario has a set of strings that’s right for your acoustic guitar. 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 by D’Addario, New York.