Ernie Ball Earthwood Rock & Blues .010 - .052 Acoustic 80/20 Bronze w/ plain G strings are 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. Rock & Blues set contains a plain G-string. Gauges .010 .013 .017 .030 .042 .052 Type: Musical Instrument Accessories