Ernie Ball 2008 Earthwood Rock and Blues Acoustic Guitar strings are engineered from 80% copper, and 20% zinc wire wrapped around hex shaped tin plated steel core wire for a crisp, ringing tone. Earthwood 80/20's are Ernie Ball's most popular acoustic guitar strings.

• Earthwood Rock And Blues Acoustic Guitar strings come in gauges 10 - 13 - 17- 30 - 42 - 52 with lighter top strings for easier string bending.