D'Addario EFT16 Flat Tops 12-53 Light Acoustic Guitar Strings Flat Tops are excellent for recording and greatly reduce finger noise. Flat Tops are round wound, then precision ground, leaving the outer surface smooth and "semi-flat." Does not sacrifice the warm tone and sustain associated with phosphor bronze strings String Gauges: Plain Steel .012, .016, Phosphor Bronze Wound .024, .032, .042, .053