XS Nickel strings have the longest life of any D’Addario electric string, plus a smooth, fast feel, thanks to the ultra-thin XS film coating. Reformulated nickel-plated steel wrap wire provides a bright tone with increased output, bite, and sustain. With a NY Steel core and Fusion Twist technology, XS Nickel offers greater break strength and unmatched tuning stability—staying in tune 131% better than standard electric strings. | XS Nickel sets have a code on the recyclable, resealable VCI bag, which you can register to earn Players Circle points.. String Gauges: .009, .011, .016, .024w, .032w, .042w |