Sharpening steel - 20 cm Hard chrome and magnetized - Black - On Card | Pratik | NOGENT. 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 a knife's edge. 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 for your Nogent*** knife is the most obvious way to maintain your knife's edge. It is important to know that knives need to be sharpened, regardless of the blade's quality. 2-year warranty! Materials: hard chrome and magnetized.