... 3.No rusted and discoloration; 4. white Ceramic knife 5,LFGB,EU,SGSCeramic Knife – High Density ZirconiaItem No.: JH3A1-P05,JH4A1-P05 ... ,JH5A1-P05,JH6A1-P05,JH7A1-P05Model: 3", 4", 5", 6", 7" ceramic knife ... kinds of acid & alkaline organic substances; keep food original color and flavor, enjoy the gourmet flavor! High quality ceramic kitchen knife