Glip ceramic knives are made out of high quality ceramic material: zirconium oxide. The blade of ceramic knives retains its sharpness about ten times longer and is about one-third lighter than steel knives. Beside the exceptional sharpness ceramic 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 steel knives. Ceramic knives also come with a non-stick surface which makes it easier to clean. Note: 1) do not sharpen ceramic knives 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 2 pieces ceramic knife; include 5-inch slicing and 8-inch chef's ceramic knives; black handle and white blade. Stay sharper longer: Hander and shaper than steel; 2nd hardest material ranked after diamond retains its sharpness about 10 times longer than steel. Rust resistant: no metal so it is resistant to acids germs oil and will never rust; fruits and vegetables do not turn brown while being cut. No metallic taste or smell: Ceramic material keeps the blade from transferring odors from one food item to another; does not alter the taste of food. Light weight: About one third lighter than steel.