The new D'Addario XTAPB1256 strings for acoustic guitar have a microscopically thin, moisture-repellent coating on all six strings that doesn't affect tone or feel. 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.