Farberware 5099532 High Carbon Stainless Steel Utility Knife with EdgeKeeper Self-Sharpening Sheath, 4.5-Inch, Black EDGEKEEPER TECHNOLOGY: Farberware Edgekeeper Knives feature a sheath with innovated technology that is designed to automatically sharpen the blade with each use. Never worry about a dull blade before use SELF SHARPENING: 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 built in self-sharpening technology guarantees a sharp blade for each use HIGH-QUALITY BLADE: The blade is made from high-carbon steel that lends strength, sharpness, and durability and will resist rust COMFORT GRIP: This knife offers an ergonomically designed handle for exceptional comfort and durability while using. Never worry about discomfort when using. EASY CARE: Hand wash with warm water and a mild detergent; rinse and dry immediately; wipe protective, self sharpening sheath as needed with a damp cloth Farberware is the #1 selling cutlery brand in the U.S. (Source: The NPD Group)