ERNIE BALL 2002 ACOUSTIC 13-56 Strings

Ernie Ball Earthwood 80/20 Bronze Acoustic Guitar Strings
are made from 80% copper and 20% zinc wire, wound around
a hexagonal brass-plated steel core wire.
These acoustic guitar strings produce a crisp,
ringing sound with pleasant overtones.
String gauges: .013, .017, .026, .034, .046, .056 (Medium)