The Chroma P11 sharpening stone is excellent value for money. Japanese-made, it will have a long lifespan while providing clean and fast sharpening. Recommended for the Chroma Type 301, Haiku, Japan Chef, etc. knife ranges. The 800 grit is used for regular preventive sharpening, to regain the starting edge. It is then possible to continue with finer stones, depending on the desired sharpness and the quality of the knives.