Knives that no longer cut sharp over time? Very annoying. With a sharpening steel, you straighten out burrs that occur over time. However, you do not sharpen your knives with this. With this ceramic Wusthof sharpening rod, you do not straighten out the burrs, but you remove a small layer of steel from the blade. This creates a new V-shape on the edge. The sharpening rod also has a higher hardness, making it suitable for almost all knives.