Made with a NY Steel core, phosphor bronze wrap wire, and Fusion Twist technology, XS coated acoustic guitar strings have incomparable break strength and tuning stability, in addition to their dramatically increased lifespan. This 11-52 Custom Light gauge set has slightly more volume and projection than Extra Light, while still being easy to play.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 our exclusive Fusion Twist, for incomparable break strength and tuning stability. XS is the most innovative coated string ever created. XS Phosphor Bronze strings have the longest life of any D’Addario acoustic string, with no fraying, peeling, or tonal dampening, thanks to the ultra-thin XS film coating. Phosphor Bronze wrap wire provides tried-and-true D’Addario acoustic tone, with beautiful balance and warmth suitable for all musical genres. With a NY Steel core and Fusion Twist technology, XS Phosphor Bronze offers greater break strength and unmatched tuning stability—staying in tune 131% better than standard acoustic strings. XS Phosphor Bronze sets come with a code on the recyclable, resealable VCI bag, which you can register to earn Players Circle points. XS coated acoustic strings are made in the USA—drawn to our exacting specifications at our New York production facility.