Street Survival Training (S.S.T.) advanced students are taught the use of the Pocket Stick.
The Pocket Stick is a simple yet powerful self defense weapon (key chain). It was developed by Takayuki Kubota as a special weapon for police officers used to restrain suspects without inflicting permanent injury on them. 

The traditional Pocket Stick is composed of a high-impact plastic rod which is made from Lexan approximately 15 cm long and 1.5 cm in diameter. It is further lined with six round groves that are designed to give the handler an additional grip plus a functional screw eye with a split ring at the end where one can attach keys. The tip of the Pocket Stick may either be pointed or flat depending on the manufacturer. 

At present there are other variations and designs being sold in the market. Some are made from aluminum alloy or titanium while others even have spikes, blades, or hidden darts. 

A Pocket Stick is designed to strike bony surfaces, nerve points and tissue. Thus, the effectiveness of this simple self defense weapon lies in the knowledge and skill of the person who will use it. If done effectively, it has the ability to temporarily paralyze or cause extreme pain to the attacker allowing the individual more time to escape.

The best places to attack when using the Pocket Stick are the stomach, the groin, the solar plexus, the arm, the hip bone, the shin, the collarbone, the kneecap, the ankle and the throat.  An accurate attack on one of these body parts will certainly keep your assailant immobile for quite some time but a more increased power strike may even lead to broken bones on the part of the assailant.

The Pocket Stick is a very simple and effective self defense weapon.