Kyocera KC Classic Series 4-1/2-Inch White Utility Knife Unrelenting Sharpness, Kyocera's ceramics hardness advantage translates into a rock like edge that will not roll like steel blades. The result is a razor sharp blade that retains its original sharpness 10 times longer than steel knifes. Unparalleled Purity. Ceramic is a pure and healthy alternative. Unlike steel blades, ceramic blades will never rust or change from its natural state. It is totally impervious to acids, juices, oils, salts, or other elements. Easy maintenance. Ceramic does not absorb food elements, allowing just a quick rinse and wipe with a kitchen towel. Hand wash or dry with kitchen towel. Ultra Lightweight. Kyocera ceramic cutlery is typically half the weight of an equivalent steak knife. This creates and extremely balanced, lightweight tool, reducing fatigue during long repetive cutting tasks. Easy maintenance, ceramic does not absorb any food elements, allowing just a quick rinse and wipe with kitchen towel after use.