Legally the most controversial of the Ryukyu weapons the Tekko is the smallest weapon, bringing the exponent closest to open hand techniques. The term 'knuckle duster' creates images of darker methods of fighting but in actuality attacks clearly defined points vulnerable to the taste of metal. The Tekko should be made to the width of the hand with anything between one and three protruding points on the knuckle front with protruding points at the top and the bottom of the knuckle. They can be made of any hard material but are predominately found in aluminium, iron, steel, or wood.