Berkley 4-Inch Fillet Knife and Sheath Guaranteed sharp out of the box, Unique knife system that matches flex to task, 5CR13MV Stainless: Optimum blend of sharpness and strength, Passivated for high lubricity, extreme corrosion resistance, Ergonomic Softorx grip, back balanced for lighter blade tip, 6" fillet in two flexes: Standard and Firm. 9" Standard Flex.