The Cold Steel Oyabun "incorporates a reinforced blade point, a high satin polish, expert heat treatment (Rc57 and sub-zero quenched), and the kind of stunningly sharp edge Cold Steel's reputation was founded upon. Furthermore, it is equipped with an integral flipper for effortless opening, and a (patent pending) leaf spring lock and safety. The lock/safety on the Oyabun was first utilized in our Crawford 1 folder and has proved to be quite tough and reliable. The 4034 stainless steel blade is housed in a strong, economical handle that's reinforced with stainless steel liners. The handle is injection molded with a Griv-Ex™ foundation and then over molded with soft, checkered Kray-Ex™ fastened to the frame with two robust bolts." - Lynn Thompson