D'Addario XS Acoustic 80/20 Bronze is a tremendous leap in coated string technology combining the revolutionary XS coating, the bold, bright 80/20 acoustic guitar strings gain maximum life, with an uncommonly smooth feel. Play brighter for longer, with the beautiful shine and longevity of XS 80/20. With its ultra-thin film coating on every wound string and a unique polymer treatment on the plain steels, XS offers the highest level of protection, for maximum life with an uncommonly smooth feel. XS also features NY Steel high carbon core and plain string wire, along with D'Addario's exclusive Fusion Twist, for incomparable break strength and tuning stability. XS is the most innovative coated string ever created