... ,4inch,5inch, 6inch knife&peeler 2.certificate:LDGB,FDA 3.acrylic block 5pcs kitchen balck knife set:Products detail:Model &Type:CB3456G3 ... as requestedCharacteristic and advantage: Blade make from Zirconium Oxide ,high-tech products Hardness is HRC 90,only secondly to the ... rust proof ,non-adhesion,very easy to cleanNo chemical reaction with the food ,no metallic taste and smellAnti-corrasion, never ...