This Ceramic Sharpening Stone has two grinding faces: a coarse side (180 grit) for repairing damaged and heavy worn edges, and a fine side (600 grit) for sharpening. The ceramic composite makes the stone both durable and strong. The shape is round and flat with a bevelled edge to prevent chipping. The fine side is 2/3 of the thickness, as this side is usually used and worn down the most. The stone is normally used with water but can be used dry. The stone comes in a protective rubber case.