Zwilling Ceramic sharpening rod is a honing rod that you use to sharpen your knives with. There are generally three types of honing rods: ceramic, steel, and diamond sharpening rod. Diamond sharpening rod is the hardest and grinds more on the knife. The ceramic gives an absurdly sharp edge and is used for knives with lower hardness or for polishing the edge after the diamond sharpening rod. Zwilling Ceramic sharpening rod gives your knives new life in just a few seconds.