D'Addario Semi-Flat Phosphor Bronze Resophonic Guitar Strings. Flat Tops are round wound, then precision ground, leaving the outer surface smooth and "semi-flat." This creates a smooth, flattened playing surface, but does not sacrifice the warm tone and sustain associated with phosphor bronze strings. Flat Tops are excellent for recording and greatly reduce finger noise.

Gauges: 16, 19, 28, 36, 44, 56