Ernie Ball Earthwood Acoustic strings provide excellent projection with crisp highs and pleasing harmonic overtones. This Rock and Blues set utilizes a plain third string to allow for more dynamic soloing. Ernie Ball Earthwood 80/20 Bronze Acoustic Guitar Strings are made from 80% copper, 20% zinc wire wrapped around hex shaped brass plated steel core wire. These Rock and Blues acoustic guitar strings contain; plain G-string providing; crisp, ringing sound with pleasing overtones. Gauges .010, .013, .017, .030, .042, .052