Description Ernie Ball Earthwood 80/20 Bronze Extra Light 10-50 Acoustic Guitar String Set 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 acoustic guitar strings provide a crisp, ringing sound with pleasing overtones. Gauges .010, .014 .020w, .028, .040, .050 “I use these when I really need something to butter my biscuits if you know what I mean (and I know you don’t).”      – Christopher Kelley of The Axe Palace