... General Description:Name:Ceramic Knife,chef knife,kitchen knife,christmas gift,PaypalMaterial :Ceramic blade and Wooden handle.Blade size:5",6 ... is made of zirconium oxide,which is very hard material,it ranks 8.5 on the Mohs scale of mineral hardness ... or alkaline organic substances.2) No metallic taste or smell, it won't react with the acid and alkali substance in ...