Crystal grindstone M-3, comes in a box of 3/クリスタル砥石Mー３(箱売り)

#400(red),#600(blue): Rough; Suitable for initial grinding

#800(plain), #1000(black): Middle; Suitable for middle grinding

#1500(yellow),#2000(green): Fine; Suitable for roiro (mirror-surface) grinding

#3000(brown): Super Fine; Suitable for finishing