Flat Tops are precision wound with phosphor bronze wrap wire over a hexagonal high-carbon steel core, then precision ground and polished. Phosphor Bronze wrap wire provides tried-and-true D’Addario acoustic tone, with beautiful balance and warmth suitable for all musical genres. Now the standard in acoustic guitar strings, Phosphor Bronze strings were originally pioneered by D’Addario in the 1970s. | D’Addario Flat Tops strings come with a code on the recyclable VCI bag, which you can register to earn Players Circle points. Our acoustic guitar strings are made in the USA—drawn to exacting specifications at our New York production facility. |