The Global ceramic water sharpener has two built in ceramic sharpening wheels - coarse and fine grains. Use the two-stage, handheld ceramic water stone sharpener for a complete sharpening process. The first stage of sharpening, use the white coarse wheel to sharpen dull and chipped edges. The second stage, use the pink medium-grit wheel for standard sharpening and polishing the blade edges. Safe and easy-to-use knife sharpener for any kitchen. 2 stage coarse and fine sharpening process Ceramic wheels help maintain blade edge between sharpening Coarse wheel and fine wheel work in tandem with water in the base of the unit to refine blade edge more effectively than honing alone Use monthly or as needed Does not replace regular sharpening, but regular use can help you go longer between sharpening sessions