Rule bank bank rules are straight strips of wood made of one piece ; usually have simple graduations, either in English units or metric system.

The ears are formed by a head harness of metal or plastic that holds two caps usually made of plastic. The device completely encloses the ear pavilion and tightly applied to the head by a foam pad or fluid-filled.

A helmet is a form of protective clothing worn on the head and usually made of metal or some other substantial material, typically to protect the head from falling objects or high-speed collisions.

squad is a template-shaped isosceles triangle used in drawing tcnico.1 can be different sizes and colors or have bevels on the edges to allow use with rapidgrafo.