XL Nickel Wound electric guitar strings are the standard against which all other strings are measured. Our 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. This 11-56 Medium Top/Extra Heavy Bottom set is designed to maintain a comfortable playing tension when tuning down a whole step to D.