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 color and provide a mellow, ringing sound, with excellent
clarity. Gauges .012, .016, .024w, .032, .044, .054