80/20 Bronze strings get their bright tone from their 80% copper and 20% tin components and are also commonly referred to as "brass" strings. 80/20 is the original acoustic string alloy selected by John D'Addario Sr. and John D'Angelico back in the 1930s. These strings are popular for recording due to their crisp, deep and projecting tone – a result of less copper and more tin than phosphor bronze. They also appeal to many traditionalists and vintage enthusiasts for their historical significance. Like all D'Addario acoustic strings, 80/20's are wound on a hexagonally shaped, high carbon steel core, resulting in long lasting, bright sounding tone with excellent intonation.