I chose this kubotan technique self defense video for how it visually displays the equalizing power of a kubotan. In this kubotan video the instructor is an older smaller gentleman and his attacking partner is younger and far bigger.
He demonstrates nicely the capability of basic kubotan moves and techniques. You can quickly understand how this self defense weapon can be used to take down a much larger opponent.
Carrying a kubotan with you on your keychain will make it always available and ready for you to implement. As we have witnessed in the above kubotan self defense video, size and age will not hinder your ability to defend yourself when using a kubotan technique on your attacker.