Everlast Coated acoustic strings use groundbreaking nanotechnology that repels unwanted moisture and oils that negatively impact your tone. Our proprietary treatment is applied to both the inner hex core and outer wrap wire to provide ultimate protection without compromising tone or feel. Made from 80% copper, 20% zinc wire wrapped around hex shaped brass plated steel core wire providing a crisp, ringing sound with pleasing overtones. Everlast 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, .022, .030, .042, .052.