... rusted and discoloration; 4. white Ceramic knife 5,LFGB,EU,SGSCeramic Knife – High Density ZirconiaItem No.: JH3A1- ... : 3", 4", 5", 6", 7" ceramic knife A seriesBlade Material: zirconium dioxide (ZrO2; also known ... made by Zirconium ceramics materials which called “ceramic steel”, have the properties as sharp-edged, wearable, ... flavor, enjoy the gourmet flavor! GOOD quality zirconia ceramic knife