D'Addario Single XT Plain Steel 009

.009 XT Plain Steel Guitar String. XT Plain Steels combines our XT coating treatment with the exclusive NYXL, High Carbon Steel alloy for extended life and unprecedented strength. High carbon steel wire and Fusion Twist technologies deliver unrivaled tuning stability and break resistance. Strings stay in tune 131% better than traditional strings! Perfect as a replacement string or for creating customized sets for both acoustic and electric guitars. All D'Addario strings are designed, engineered, and manufactured in the USA