D'Addario EJ11 Light Acoustic Guitar Strings 12-53

EJ11 Light 12-53 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, bold, and projecting tone and appeal to many traditionalists for their historical significance.

eBay