Glip ceramic knives are made out of high quality steel and ceramic material: zirconium oxide. The blade of ceramic steel knives retains its sharpness about ten times longer and is about 50% lighter than traditional steel knives. Beside the exceptional sharpness, ceramic steel knives will never rust. Moreover, ceramic blade does not oxidize food; thus, fruits and vegetables do not turn brown while being cut. Ceramic material keeps the blade from transferring odors from one food item to another. Therefore, it does not alter the taste of food. It also won't give your food a metallic smell or taste like the traditional steel knives. Ceramic steel knives also come with a non-stick surface, which makes it easier to clean. Note: 1) do not sharpen ceramic blades with sharpener made for steel knives (Ceramic knives can only be sharpened using a powered diamond sharpening wheel); 2) Always use wood or plastic cutting board; 3) Hand-wash only; 4) do not cut frozen food, bones, food with thick skin, coconut, or hard pastry such as bread; 5) Use your steel knives for heavy duty cutting. 6) The tip is extremely fragile. Do not drop. Set of 6 pieces ceramic steel knife; include 8" chef's knives, 8" bread knife, 8" slicing knife, 5" fruit knife, 3" fruit knife, and ceramic peeler. Ultra sharp and durable blade, minimal chances of worn and torn. easy to clean and non-adhesion. Hygienic and never rust. Impervious to acid, alkalis and salt. No metallic taste or smell, keeping the food fresh and tasty. Lightweight and perfect balance makes it a pleasure to use.