XS brings a new breath to coated strings. With its ultra-thin film coating on each wound string, as well as its unique polymer treatment on the treble strings, this new range offers our highest level of protection for maximum lifespan with an exceptionally smooth feel. XS also incorporates our high-carbon content steel core "NY Steel," as well as our exclusive winding process "Fusion Twist," for unparalleled break resistance and tuning stability. Available in phosphor bronze for 6 and 12-string acoustic guitars, in a variety of gauges ranging from Extra-Light to Medium.