The D'Addario EJ17 Phosphor Bronze Acoustic Strings are a set of medium tension strings specifically designed for acoustic guitars. Made with high-quality phosphor bronze material, these strings offer a warm and bright tone that is ideal for producing rich and clear sound. With a string gauge of 0.013 inches, these strings provide a perfect balance of tension and brightness for acoustic guitars. The roundwound winding and uncoated guitar string coating add to the overall quality and durability of the strings, making them a popular choice among musicians and guitar enthusiasts.