* This combination whetstone has a J3000 grit side to smooth the edge of your blade, and a J6000 grit side to hone and polish 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 J3000/J6000 grit sides to smooth and polish * Includes rubber tray for stability