This time we are shown what kind of weapons samurais could hide when they had to go in 'weapon free zones', I myself have something very similar to the "ring" used in this video which I always have on me when I have to cross a chav infested area at night, you can buy them on ebay, they are called kubotans and are legal to carry, you can also get cheap self defence courses on how to use them pretty much anywhere.
