Toponeware CKBKBEGNRDBK34567 5-Piece Ceramic Knife Set, Blue/Green/Red/Black Set of 5 pcs ceramic knife; 3-inch paring 4-inch utility 5-inch slicing 6-inch chef's and 7-inch chef's ceramic knives; mixed color handle/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