The kubotan is usually the length of a pen, and about as thick as a magic marker. It is made of steel, wood, aluminum or plastic, and usually weighs less than 2 ounces. It has a key ring attached to it, to increase the element of surprise -- and to hold your keys.
One of the best ways to use the kubotan in self-defense is to attack at pressure points. This involves hitting someone in a sensitive nerve area. Other uses for the kubotan include placing it in the palm of the fist to increase punching strength. It can even be used as a nunchaku in the right hands. Although Kubota was a karate master, the kubotan is often included in Krav Maga training.