The caution Sharp knife cuts Imagine paper thin tomato slices or perfectly diced onions, meat, chicken, fish. The blade is made of an advance ceramic called zirconium oxide that is much harder than steel, and second in hardness to only diamond. the product is also non-reactive, which means this knife will not rust and is easy to clean. Because of their resistance to strong oils and acids, they won’t absorb flavors or odors from foods; which won’t leave any after-taste residue on foods that you slice. It also keeps fruit and vegetables from browning as quickly.