XL Nickel Wound electric guitar strings are the standard against which all other strings are measured. D'addario's best-selling electric set, XL Nickel has been revered by players everywhere since 1974. Made with a high carbon steel core and nickel-plated steel wrap wire, XL Nickel strings have a bright, versatile tone, ideal for a wide variety of musical styles. 11-49 Medium gauge sets provide increased volume, with slightly more tension and resistance.