XS PHOSPHOR BRONZE 12-53 Light Set   XSAPB1253   D'Addario XS Acoustic Phosphor Bronze strings combine their most popular acoustic alloy with advanced string coating technology, resulting in clear tone, smooth feel, and superior tuning stability – all with the longest possible string life. 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. XS also features NY Steel high carbon core and plain string wire, and D'Addario's exclusive Fusion Twist, for incomparable break strength and tuning stability.