Thanks to its flat surface, the sharpening stone facilitates optimal and long-lasting sharpening angle retention along the entire length of the blade. The sharpening stone is the most obvious way to maintain the edge of a knife. The stone is soft, yet hard enough to restore the blades to their original sharpness. Sharpening a knife with a sharpening stone helps achieve a more blade-friendly sharpening quality. You can then enjoy a sharp blade for longer while ensuring the cutting power of your blade. Using a sharpening stone on your Nogent*** knife is the most obvious way to maintain the edge of your knife. It is important to know that knives need to be sharpened, regardless of the quality of the blade. It is the essential step to regain optimal sharpness and cutting quality. 2-year warranty! Materials: high-quality silicon carbide CD180.