EARTHWOOD LIGHT 80/20 BRONZE ACOUSTIC GUITAR STRINGS - 11-52 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 .011, .015, .022W, .030, .042, .052