Made from 80 copper, 20 zinc wire wrapped around hex shaped tin plated steel core wire. The most popular acoustic guitar strings provide a crisp, ringing sound with pleasing overtones. The Eagles, John Mayer, and Chris Cornell are just a few of the many musicians who play these strings both live and in the studio. Made with the finest and freshest raw materials, all Ernie Ball strings are hermetically sealed to ensure your strings stay as fresh as the day they were made. Gauges Include: Ernie Ball Earthwood 80/20 Light: .011 .015 .022w .030 .042 .052