... No rusted and discoloration; 4. white Ceramic knife 5,LFGB,EU,SGSCeramic Knife – High Density ZirconiaItem No.: JH3A1-P05 ... JH7A1-P05Model: 3", 4", 5", 6", 7" ceramic knife A seriesBlade Material: zirconium dioxide (ZrO2; also known ... Refining made by Zirconium ceramics materials which called “ceramic steel”, have the properties as sharp-edged, ... the gourmet flavor! GOOD quality zirconia ceramic knife