... healthy and conevnient.Available Size: 3", 4", 5", 6", 7", 1#cut knife, 2#cut knife, 3#cut knife ... Kitchen Knives property: ItemUnitInspection ResltsCompositionwt%94.8%ZrO² 5.2%Y²O³Specific Densityg/cm³6.0Hardness(HV ... to 400°c 9.6Fracture ToughnessMPam½8Grain Sizeum<6Characteristic:1: Ceramic Knife has a high hardness. It will ... New style Zerconium Ceramic Kitchen Knife set C4",C5",C5"-1,C6",G5",I7"