Tojiro Professional Sashimi Knife This is a masterpiece series of free hand forging knife. Aogami, the best material of iron, is employed for the core edge and layered with carbon irons that have different carbon content. We forged Aogami steel that has excellent keenness, fracture toughness and abrasion resistance to make its atom more compact. It realized amazing keenness that we have never experienced. The beautiful ripple pattern is a proof of the keenness just like Japanese swords.