The Japanese double edge slicing knife Ittetsu Sujihiki IW-11812Z with 240 mm blade. This blade 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. Avoid Bones, Frozen foods, nuts and hard candies or anything other than fruits, vegetables and proteins. Handle is made of waterproof mono octagonal Keyaki (Zelkova). Ittetsu knives are handmade in Echizen city, Japan. Hand wash with warm water and towel dry.