Quality MaterialOur measuring ruler tool is made of transparent plastic; It is lightweight, easy to carry; The transparent material allows you to draw without ignoring some important numbers or words. Multi-functional parallel rulerEasily draw horizontal and vertical parallel lines, draw circles, curves, arcs and other geometric figures. Wide Application The wheeled drawing ruler is very suitable for students, teachers, artists, designers and architects to draw and measure various geometric figures. Portable Lightweight, smooth and easy to draw , with a clear scale, the parallel ruler is easy to observe. the parallel ruler is made of high quality PVC plastic with long service life. Draw the arc and curveInsert the pin into the small hole at the end of the ruler to make the center of the circle, insert another pen into another hole and rotate the ruler body 360 to draw a circle.