Forschner Fillet Knife 7". This is one of our best selling fillet knives. The fillet knife is long and narrow so that it can easily slide under the skin and down the backbone of fish. Victorinox’s 7” Black Fibrox Fillet Knife (40710) has a stiff blade and patented black FIbrox handle made from a hygienic polyamide that is textured and slip-resistant when wet for maximum safety. The edge of the blade is conically ground and laser tested to ensure durability and world renowned sharpness. All black Fibrox® knives are manufactured in Switzerland by Victorinox, the makers of the original Swiss Army Knife, and come with a lifetime warranty.