Ernie Ball Earthwood acoustic bass strings set 45-95 Ernie Ball Earthwood Phosphor Bronze acoustic bass strings are made from 92% copper, 7.7% tin, 0.3% phosphorus wire wrapped around tin plated hex shaped steel core wire. These acoustic bass guitar strings have a light orange, gold color and provide a mellow, ringing sound, with excellent clarity. Gauges: 45-55-80-95