Japanese bunka knife Ittetsu with 165 mm blade. This bunka is made from 3 layers of material: iron clad and Shirogami steel. A layer of iron on each side protecting a layer of carbon steel at the core, in a process referred to as Sanmai or forge welding. Iron and carbon steel are both susceptible to rust and must be kept dry and clean at all time’s to avoid oxidation and discolouration. Handle: waterproof mono octagonal walnut. Ittetsu knives are handmade in Echizen city, Japan. Do not attempt to cut, hit or chop frozen products or bones. The blade can chip or break. Hand wash with warm water and towel dry.