Ernie Ball Earthwood 80/20 Bronze Acoustic Guitar Strings feature an 80% copper and 20% zinc wrap over a hex-shaped brass-plated steel core. Designed for Rock and Blues, these strings include a plain G-string that delivers bright, clear tones with rich overtones. Available in .010, .013, .017, .030, .042, and .052 gauges, they offer a balanced sound perfect for dynamic acoustic play.