Description Lightweight and easy-to-use steel features a highly efficient ribbed surface for re-sharpening and a smooth surface for honing. Kyocera’s ceramic sharpening rods are made of advanced ceramic, a material close in hardness to diamond. When your steel knife or cutting tool is dull, use the ribbed side to create a finely ribbed texture on the cutting edge. Then use the smooth surface to hone or finish the edge. If intense sharpening is not required, then honing should be sufficient to maintain a sharp edge. Not intended for use on ceramic knives or scissors. Features Lightweight and easy-to-use steel Features a highly efficient ribbed surface for re-sharpening and a smooth surface for honing Kyocera’s ceramic sharpening rods are made of advanced ceramic, a material close in hardness to diamond Use the ribbed side to create a finely ribbed texture on the cutting edge Then use the smooth surface to hone or finish the edge If intense sharpening is not required, then honing should be sufficient to maintain a sharp edge Specifications Dimensions: 9" Material: Ceramic Warranty: Kyocera advanced ceramic cutlery and kitchen tools are fully warranted to be free of defects in material and craftsmanship Manufactired in Japan, assembled in China