Gauges .045, .065, .085, .105EXP165 Coated Bass Strings provide longer life and increased durability coupled with the brightness, clarity, and sensitivity you've come to expect from D'Addario strings. Here is how they work: An ultrafine layer of EXP coating is bonded to the phosphor bronze wrap wire and is then wound onto the hex-shaped core wire. The result is a built-in barrier against corrosion and wear, which can quickly sap the life out of your strings and your sound. And because the EXP coating is cross-linked to the wrap wire prior to winding, the strings sound fresh and bright. New-string tone lasts 3 to 4 times longer than with traditional strings.D'Addario is the world's largest manufacturer of strings for musical instruments. Many top guitarists won't play any other brand. Regardless of your playing style, D'Addario has a set that's right for you.