This is the JBL the Shiv-X Freediving Fish Stoning Stainless Steel Knife Features: Solid 416 stainless steel construction Tapered double-edge blade Blade measures 4.5 inches Straight and serrated edges No-slip ergonomic polymer handle Low profile sheath Introducing the Shiv-X, the perfect knife for freediving. It features solid 416 stainless steel construction for corrosion resistance and maximum sharpness retention, no-slip ergonomic polymer handle, low profile sheath, and a tapered double-edge blade ready to handle anything you throw at it.