Earthwood: Acoustic Guitar Strings - Medium (13-56)

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. 
Made in the USA.
Gauges .013, .017, .026, .034 .046, .056