Ryumon Forged Practical Katana. - RY3037 This Practical Katana has a hand forged and AISI-1060 carbon steel live blade that is heat treated with traditional processes to produce an extremely sharp ha (edge). Each Ryumon hand forged and folded sword in this series utilizes a one-piece brass construction habaki (blade collar) that enables the blade to fit securely into the saya (scabbard). The saya (scabbard) is finished with a deep black lacquer and tied with imported Japanese cotton sageo. The tsuka (handle) is wrapped with authentic ray skin (same) and imported Japanese cotton ito.