Earthwood: Acoustic Guitar Strings - Phosphor Bronze, medium (13-56)

Ernie Ball Earthwood Phosphor Bronze Acoustic Guitar Strings are made from 92% copper, 7.7% tin, 0.3% phosphorus wire wrapped around tin plated hex shaped steel core wire. 
These guitar strings have a light orange, gold colour and provide a mellow, ringing sound, with excellent clarity. 
Made in the USA.
Gauges .013, .017, .026, .034, .046, .056