12 string acoustic guitar set. Made from 92% copper, 7.7% tin, 0.3% phosphorus wire wrapped around tin plated hex shaped steel core wire. Earthwood Phosphor Bronze strings are precision wound with phosphor bronze wire providing a warm, balanced tone with superior intonation and consistency. The core is made from brass plated high carbon steel hex wire providing excellent durability. These guitar strings have a light orange, gold color and provide a mellow, ringing sound, with excellent clarity. Gauges .009 .009, .012 .012, .020w .009, .026 .012, .036 .020p, .046 .026