Farberware EdgeKeeper Knives feature a sheath with innovated technology that is designed to automatically sharpen the blade with each use. The EdgeKeeper protective sheath contains a built-in mechanism that hones the blade before and after each use maintaining a blade s razor-sharp edge. The blade is made from high-carbon steel that lends strength sharpness and durability. Knives are not dishwasher safe. Hand-wash with warm water and a mild detergent; rinse and dry immediately.