* This combination whetstone has a J400 grit side to restore and sharpen the edge of your blade, and a J1000 grit side to smooth that edge. Soak the stone in water before using, and hold your knife at the correct angle while sharpening. Includes a rubber tray for stability. * Combination whetstone has J400/J1000 grit sides to restore, sharpen, and smooth * Includes rubber tray for stability