TOZO Ceramic Knife Set Cutlery - Zirconia Ceramic Knife Include 6.5 inch Slicing Knife, 6-inch Multi-function Knife, 4 inch Fruit Knife, Fruits / Vegetables Plane / the Shelf (Black Blade) Sharpness: Thanks to the hardness, this ultra-sharp ceramic blade retains its original sharpness much better than steel blades. Hardness 9: Only Second to the World's Hardest Substance - Diamond (Hardness 10), 60 Times Durability Compare to Steel Blades, Permanently No Need Sharpening. Purity and healthy: Rust-proof, will never brown foods, impervious to acids and oils, no metallic taste or smell. Advanced ceramic is a pure & healthy alternative. Lightweight: Typically half the weight of metal-based knives, offers total ease of use with the most difficult cutting tasks. Ergonomic handles produce a well-balanced, highly controlled grip. Easy to Clean: Advanced ceramic does not absorb any food element, allows just a quick rinse and wipe with a kitchen towel or paper.