D'Addario Acoustic EXP80/20 (EXP Coated 80/20 Bronze Round Wound)

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 and your sound. EXP coated phosphor bronze bass strings have a natural round wound feel and sound fresh and bright with a "new string tone" that lasts three to four times longer than traditional guitar strings.