EARTHWOOD LIGHT 12-STRING 80/20 BRONZE ACOUSTIC GUITAR STRINGS - 9-46 GAUGE ERNIE BALL EARTHWOOD 80/20 BRONZE ACOUSTIC GUITAR STRINGS ARE MADE FROM 80% COPPER, 20% ZINC WIRE WRAPPED AROUND HEX SHAPED BRASS PLATED STEEL CORE WIRE. THESE ACOUSTIC GUITAR STRINGS PROVIDE A CRISP, RINGING SOUND WITH PLEASING OVERTONES. GAUGES .009 .009, .012 .012, .020W .009, .026 .012, .036 .020P, .046 .026