Gauges: 11-15-26-40 An ultrafine layer of EXP Coating is bonded to the 80/20 bronze wrap wire, 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. They offer natural round wound feel and will sound fresh and bright 3 to 4 times longer than traditional guitar 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.Gauges: 11-15-26-40