Kyocera Revolution 5-piece Ceramic Knife Set (Black) Unrelenting Sharpness: razor-sharp blade stays sharper longer Unparalleled Purity: Will never brown foods. No metallic ions to transfer  wont alter the taste, smell or appearance of food. Will never rust Ultra Lightweight: Perfectly balanced and light, reduces fatigue during repetitive cutting tasks Lifetime Warranty: Buying a Kyocera knife is buying for life. If your knife is chipped or damaged, Kyocera Tycom Corp. (KTC) will repair or replace Lifetime Complimentary Sharpening: Kyocera will sharpen your knives back to a factory new edge