D Addario s lightest gauge of acoustic strings EJ10s are ideal for beginners or players who prefer a softer tone and easy bending. 80/20 Bronze commonly referred to as brass is the original acoustic string alloy selected by John D Addario Sr. and John D Angelico in the 1930s. 80/20 Bronze strings are popular for recording due to their crisp deep and projecting tone and appeal to many traditionalists and vintage enthusiasts for their historical significance. All D Addario acoustic strings are wound on a hexagonally shaped high carbon steel core resulting in long lasting bright sounding tone with excellent intonation.