The new D'Addario XTC44 concert guitar strings have a microscopically thin, moisture-repellent coating on the wrapped strings that doesn't affect the tone or feel of the instrument. The new, improved coating process preserves the feel of fresh strings that last at least three times longer. Made from "High Carbon New York Steel", XT strings achieve higher tensile strength and tuning stability.
D'Addarrio produces everything from the production of the basic material to the coating and winding of the strings in its own factory.