Damascus Suminagashi Maguro Tuna Knife Yasuki Hagane Carbon Steel JapanDescription The tuna knife feature beautiful Damascus patterned blades with a core of Aogami blue steel, which is made from famous Yasuki steel, known as prime high carbon steel, specifically developed for tools and knives. In order to prevent distortion caused by the extra long blade, this tuna knife is manufactured using the laminated steel method of forging, in which layers of base iron and Aogami blue steel are folded over one another to form a