Kyocera 2 Piece Ceramic Knife Gift Set with Bamboo Cutting Board 12 x8" Razor-sharp blade stays sharper longer. Kyocera advanced ceramic blades offer superior edge retention, holding their edge at least 10 times longer than other professional cutlery, including high carbon steel. Will never brown foods. No metallic ions to transfer ? won?t alter the taste, smell or appearance of food. Will never rust. Perfectly balanced and light, reduces fatigue during repetitive cutting tasks.