An ultra-fine layer of EXP Coating is bonded to thenickelplated steel outer wrap wire which is then wound onto the hex-shaped corewire. The result is a built-in barrier against the corrosion and wear that canquickly sap the life out of your strings and your sound. EXP coated nickelwound bass strings have a natural round wound feel and sound fresh and brightwith a 'new string tone' that lasts three to four times longer thantraditional guitar strings.