... with industrial grade diamond sharpeners. 2.Health (Not rust):Our ceramic knife is made of biomedicine material,not including nickel,lead ... ,not-magnetism,non-conductive,non-slabby,and easy to clean. Ceramic material has strong chemical stability,anti-corrosion,no chemical reaction ... the shape of the blank till the firing process. Like all ceramics these are hardened by firing at around 1600 degree ...