Made from 92% copper, 7.7% tin, 0.3% phosphorus wire wrapped around brass plated hex shaped steel core wire. These guitar strings have a light orange, gold color and produce a warm, rich sound with excellent clarity. Available in Extra Light (10-50), Light (11-52), Custom Light (11.5-54), Medium Light (12-54), Custom Medium (12.5-56), Medium (13-56), Rock and Blues (10-52),12-String Light (9-46), and 12-string Custom Light (10-48).