Three-set packs of strings for Acoustic Guitar. Made from 80% copper, 20% zinc wire wrapped around hex shaped tin plated steel core wire. The most popular acoustic guitar strings provide a crisp, ringing sound with pleasing overtones. Earthwood 80/20 Bronze strings are precision wound with 80/20 bronze wire providing a bright, balanced tone with superior intonation and consistency. The core is made from brass plated high carbon steel hex wire providing excellent durability. Gauges .011, .015, .022w, .030, .042, .052