The 80/20 Bronze, commonly known as brass, is the original acoustic chain alloy chosen by John D'Addario Sr. and John D'Angelico in 1930. The 80/20 bronze chains are popular for your tone. lively, lively and deep which has always fascinated traditionalists and music lovers alot. All D'Addario acoustic strings are wound on a high carbon steel hexagonal core for longer life, brighter sound, excellent intonazione.Il September light J62 mandolin bronze 80/20 guarantees a rich and brilliant sound on all 4 strings; perfect for recording.