Strings are plain steel and round wound 80/20 bronze, extra light gauge 010 014 023w 030w 039w 047w. This alloy is often referred to as brass. It is the original acoustic string alloy selected by D'Addario and D'Angelico in the 1930s. They are often used for recording due to their crisp, deep, and projecting tone; a popular choice for stage and studio.