The whetstone has a roughness of #1000 and thrills both aspiring hobby chefs as well as demanding professional restaurateurs. The whetstone enables you to effectively and easily resharpen different blades. Although the whetstone was specially designed for Miyabi knives, it can also be used for all other professional knives and types of steel. However, a different whetstone should be used for ceramic knives. The synthetic ceramic whetstone offers you the best sharpening results with little effort. Normally, the blade?s material is worn down very quickly.