Strings are plain steel and round wound 80/20 bronze, custom light gauge 011 015 022w 032w 042w 052w. 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.