... SGS Approved Anti-corrosion,anti-bacterial Tasteful Ceramic Knife:Products detail:Model &Type:Ceramic KnifeBlade Material:Zirconium OxideHandle Material: ABS+ ... cutting board ,Avoid cutting on marble ,stone, glass surfacewash by hand with water and liquid dish soap ,do not wash it ... and character,pleases do not try to sharpen it by yourselfcompositionWt%ZrO2+Y2O3%≥99.5specific densityg/cm³>0.6Hardness ...