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. D'Addario offers a full range of acoustic guitar singles for all your replacement or customization needs. .035 gauge bronze wound acoustic guitar string. Extra-bright tone mixed with deep and projecting bottom end. Perfect as a replacement string or for creating customized sets. Made in the U.S.A. for the highest quality and performance.