Give your acoustic guitar a unique look and a solid sound with these Ernie Ball 2146 Earthwood phosphor bronze acoustic guitar strings. The light orange and gold hues from the copper stands out against the backdrop of your instrument while producing a mellow ringing sound with distinct clarity in each chord. Ernie Ball designed these with a steel core for excellent durability. Features Made from 92 percent copper, 7.7 percent tin, 0.3 percent phosphorus wire Tin-plated hex-shaped steel core wire Gauges .012, .016, .024w, .032, .044 and .054