D'Addario 3 Pack EJ14 Bluegrass 80/20 Bronze 12-56 80/20 Bronze, commonly referred to as brass, is the original acoustic string alloy selected by John D'Addario Sr. and JohnD'Angelico in the 1930s. 80/20 Bronze strings are popular for recording due to their crisp, bold, and projecting tone and appeal to many traditionalists for their historical significance. Diameter Tension Item# Note inches mm lbs kg PL012 E 0.012 0.3 23.3 10.57 PL016 B 0.016 0.41 23.3 10.57 BW025 G 0.025 0.64 31.9 14.47 BW035 D 0.035 0.89 34.8 15.79 BW045 A 0.045 1.14 32.8 14.88 BW056 E