Ernie Ball Earthwood Phosphor Bronze Custom Medium 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: .012.5, .016.5, .024W, .034, .046, .056