Toponeware CKBKB48 2-Piece Ceramic Knife Set, Black Set of 2 pieces ceramic knife; include 4-inch utility and 8-inch chef's ceramic knives; black handle and black 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