... sharp; 3.No rusted and discoloration; 4. white Ceramic knife 5,LFGB,EU,SGSCeramic Knife – High Density ... JH7A1-P05Model: 3", 4", 5", 6", 7" ceramic knife A seriesBlade Material: zirconium dioxide (ZrO2; also ... ,Refining made by Zirconium ceramics materials which called “ceramic steel”, have the properties as sharp-edged, wearable ... the gourmet flavor! High quality zirconia ceramic chef knife with sheath