... 3", 4", 5", 6", 7", 1#cut knife, 2#cut knife, 3#cut knife, and other ceramic knives.Blade ... Knives property: ItemUnitInspection ResltsCompositionwt%94.8%ZrO² 5.2%Y²O³Specific Densityg/cm³6.0Hardness(HV)GPa> ... Knife has a high hardness. It will sharp ever.2: The fine and close surface of blade would avoid ... ': aBigImageSrc } ); } )(); New style Zerconium Ceramic Kitchen Knife set C4",C5",C5"-1,C6",G5",I7"