... healthy and conevnient.Available Size: 3", 4", 5", 6", 7", 1#cut knife, 2#cut knife, 3#cut ... Knives property: ItemUnitInspection ResltsCompositionwt%94.8%ZrO² 5.2%Y²O³Specific Densityg/cm³6.0Hardness ... 400°c 9.6Fracture ToughnessMPam½8Grain Sizeum<6Characteristic:1: Ceramic Knife has a high hardness. It ... covers 60,000 square meters with intelligentized and multi-functional plants, R & D center and garden ...