In the design of the Katai knives, wave-like shapes have been used as a source of inspiration. This is reflected in the shape of the blade and how the shape continues into the handle. The blade is fully hand-forged in 5 layers of Japanese VG10 steel. The hammered finish on the blade is basically the same as the other series. However, it has undergone an additional treatment using a very fine hammer. This method of processing is more intensive but results in a refined look with a completely unique appearance. The handle, in turn, is made from burl wood. The wood is first filled with resin, then pressed and subsequently shaped. Through this process, each knife is unique in finish, size, color, and wood structure.