Three Herbertz sharpening stones are mounted on a wooden block, measuring 15 x 4.5 x 1.5 cm, and can be rotated: Coarse: silicon carbide for initial sharpening; Medium: soft Arkansas for refining; Fine: hard Arkansas for the final touch. The delivery includes a bottle of sharpening oil. The coarse silicon carbide stone has a grit of 180/200. The medium natural Arkansas stone is comparable to grit 800 (natural stone), and the fine natural Arkansas stone is comparable to grit 1000 (natural stone).