Ceramic sharpener is excellent for metal based knives, scissors and other cutting tools. Dual use for both sharpening and honing, this super efficient sharpening rod is made out of advances ceramic, a material close in hardness to diamond. The material strength of this sharpening rod will provide excellent results when re-sharpening or honing the cutting edge of your metal based knives, scissors and cutting tools. JOHNCERA’s advanced ceramics are resistant to rust, wear, acids and alkalis.