Ernie Ball 2010 Earthwood 12-String Light 80/20 Bronze Acoustic Guitar Strings Set,;0909-1212-0920-1226-2036-2646 Gauges - .009.009, .012.012, .020w.009, .026.012, .036.020p, .046.026 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. [fcntr]