... steel,and 10 for diamond,giving a very hard edge that rarely needs sharpening.2.Hygiene1) stain and rust ... infiltrate the blade,3.Cleaning easier, smooth surface that food does not stick to4.Easy to use-Lightweight ... with you fingers.The blade is so sharp that would hurt you fingers.2. Suitable for the ... ,bone or cut frozen food and cheese.Because that requires a more flexible knife,such as steel ...