The tekken is a similar Japanese weapon, to some extent, with a " American Fist " , but adapting only to one finger, and not to all the hand, like this last.

It is composed of a simple decorated metal ring from 4 to 6 points, from approximately 3 to 5 mm length each one. Often coated poison, it goes on the major one or the annular one, the points directed towards the interior of the hand. One can use it to scrape the skin, to strike with the temples, under the chin, the face in general, with the genitals, or to neutralize the hand of an adversary, if ever the need is made some feel (if one is victim of a strangulation, for example).

This weapon more defensive than offensive was used extremely often by the Ninja S, with each " mission" , because it made left the basic equipment of the ninja, as a police officer carries permanently, if not his weapon of service, a Tonfa.