... ,Healthy 5.Non-stick surface ceramic knife with sheath ,White blade and zirconium oxide Ceramic ... size:3 inch,4inch,5inch,6inch4,Knife set with sheath. Ceramic Knife: hardness of our ... not sharpen the blade with traditional sharpener.5.Ceramic knives should be hand washed with mild detergent. They ... can be stored in a knife block or a knife sleeve ceramic knife with ...