D’Addario EXP12 80/20 Bronze 13-56 Medium Acoustic Guitar Strings

An ultra-fine layer of EXP Coating is bonded to the phosphor bronze outer wrap wire, which is then wound onto the hex-shaped core wire. The result is a built-in barrier against the corrosion and wear that can quickly SAP the life out of your strings. EXP coated phosphor bronze Bass strings have a natural round wound feel and Sound fresh with a "new string tone" that lasts three to four times longer than traditional Guitar strings.