Ernie Ball 2003 Earthwood 80/20 Bronze Medium Light Acoustic Strings (3-Pack) 2003 Earthwood 80/20 Bronze Medium Light Acoustic Strings (3-Pack) Gauges 12-16-24w-32-44-54 These strings are made from 80% copper, 20% zinc wire wrapped around hex-shaped tin-plated steel core wire These popular acoustic strings provide a crisp, ringing sound with pleasing overtones All Ernie Ball strings are precision manufactured to the highest standards and most exacting specs to assure consistency, optimum performance and long life