D'addario Flat Tops are half round phosphor bronze acoustic strings designed to greatly reduce unwanted finger noise. They combine classic phosphor bronze tone with a smoother feel for a quieter, more controlled playing experience—perfect for recording or slide guitar. Built with a high carbon steel core and precision-ground phosphor bronze wrap wire, these strings deliver a semi-flat surface, smooth feel, and balanced tone. The 13-56 Light gauge set offers the ideal mix of tone and playability, making it a popular choice for acoustic players.