Semi-flat phosphor bronze acoustic guitar single strings. Perfect as a replacement string or for creating custom sets. Part of the D'Addario Flat Tops string series. D'Addario Flat Tops are round wound, then precision ground, leaving the outer surface smooth and "semi-flat." This produces a smooth, flattened playing surface, but does not sacrifice the superb tone and sustain associated with phosphor bronze strings. Flat Tops greatly reduce finger noise and are excellent for recording and flat-picking. .023 gauge semi-flat phosphor bronze acoustic guitar string Smooth, flattened playing surface, superb tone and sustain associated with phosphor bronze strings Perfect as a replacement string or for creating customized sets Made in the U.S.A. for the highest quality and performance