Strings are plain steel and round wound 80/20 bronze, light gauge 012 016 024w 032w 042w 053w. 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.