Ernie Ball Earthwood 80/20 Bronze Acoustic Guitar Strings feature a blend of 80% copper and 20% zinc wire wound around a hex-shaped, brass-plated steel core. Designed for a bright, resonant tone with rich overtones, these strings offer excellent clarity and projection. Available in gauges .010, .014, .020w, .028, .040, and .050, they deliver reliable playability and vibrant sound for any acoustic guitarist.