Made from 92% copper, 7.7% tin, 0.3% phosphorus wire wrapped around hex-shaped brass plated high carbon steel core wire. These guitar strings have a light orange, gold color and provide a mellow, ringing sound, with excellent clarity. Gauges .012, .016, .024, .032, .044, .054 Ernie Ball 2146 Earthwood Phosphor Bronze Acoustic Guitar Strings Medium Light 1254 Features at a Glance: Type: Acoustic 6-String .012, .016, .024, .032, .044, .054 Mellow tone Tin-plated hex steel core Phosphor bronze Ernie Ball Slinky Acoustic Phosphor Bronze strings give you a mellow and warm tone!