Given the danger around us during these bad times, it is important to carry a self-defense tool. Cold Steel recognizes this need and thus offers the Koga SD1 Nylon. Cold Steel Koga SD1 Nylon is developed by Bob Koga based on the Japanese weapon Yawara stick. Inspired with the same power of the Yawara sticks, Cold Steel Koga is made of virtually indestructible plastic so it is lightweight to carry yet destructive as a tool. It functions as a fantastic tool that promises your oppressor to have their bones broken, muscles pulverized and nerves shocked---all without hurting your knuckles and joints.