D’Addario XL Nickel Wound Electric Guitar Strings Your strings matter. D’Addario’s XL Nickel Wound electric guitar strings are engineered to serve as the critical link between you and your guitar. Our most popular electric guitar strings, XL’s are precision wound with highly magnetic nickel-plated steel to exacting specifications, resulting in strings with long lasting, distinctive bright tone, and excellent intonation. Ideal for the widest variety of guitars and musical styles, XL’s are the choice of countless professionals around the world. Anatomy of a D’Addario XL Electric Guitar String Three components of a D’Addario guitar string work together to create your desired tone: Hex-core, outer wrap wire, and ball-end. It all starts with the core. D’Addario pioneered the use of the Hex Core, and as the name suggests, it is a six-sided high carbon steel core-wire. Each side “bites” into the wire used for the outer winding, creating a tight and consistent bond that keeps the string in tun