Sumkica Ceramic Knife Set, Black Blade Kitchen Knives - 9-piece Cutlery Set (6" Chef's, 5" Utility/Slicing, 4" Fruit Slicer, 3" Paring, Vegetable Peeler & 4 x Sheaths) Ultra sharp ceramic blades stay sharp 15x longer than steel Won't brown foods or transfer metallic taste or smell Rust-proof, stain-proof and germ resistant Comfortably ergonomic and perfectly balanced Made out of very hard and tough ceramic (Zirconia 206)