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D'Addario XSAPB1356 Acoustic Phosphor Bronze Medium 13-56
XS Acoustic Phosphor Bronze combines D'Addario's most popular acoustic alloy with their most advanced string coating technology, resulting in clear tone, smooth feel, and superior tuning stability — all with the longest possible string life.
XS is breathing new life into coated strings. With its ultra-thin film coating on every wound string and a unique polymer treatment on the plain steels, XS offers our 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.