D'Addario's XS Coated Nickel Wound 11-56 Electric Guitar Strings, known for their maximum tone life, offer an ultra-thin and durable film coating that protects the wound strings. The plain strings receive D'Addario's proprietary XT treatment for enhanced durability. This set boasts a class-leading NY steel core and reformulated nickel-plated steel wrap wire for strength and a fast, smooth, and soft feel. The Fusion Twist ball-end ensures unparalleled tuning stability. XS strings provide best-in-class durability.