Ernie Ball 2004 Earthwood 80/20 Bronze Light Acoustic Guitar Strings 6 Pack A 6-pack of high-quality, long-lasting strings Ernie Ball 2004 Earthwood Acoustic Guitar strings are crafted from 80% copper, 20% zinc wire wrapped around hex-shaped tin-plated steel core wire Among the most popular acoustic guitar strings from Ernie Ball, they 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 Gauges 11-15-22w-30-42-52