A self-defense tool developed by TAKAYUKI KUBOTA. This tool serves normally as a key chain.

The Kubotan (sometimes spelled Kubaton) or self-defense keychain, is a highly accessible, durable, and effective self-defense weapon. It is essentially a shortened Yawara, usually less than 8" long and slightly thicker than a marker pen. Typically attached to a keyring for convenience and concealment, the kubotan appears to be an innocuous key fob to the untrained eye.