D'Addario EFT15 Flat Tops 10-47 Extra 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 .010, .014, Phosphor Bronze Wound .023, .030, .039, .047