Premium Material: Our geometric rulers are made of high quality plastic, exquisite workmanship, lightweight and durable. Transparent design allows you to paint without ignoring some important numbers or text. Accurate Scale: Size of each plastic ruler about 21.5 x 8.5 cm / 8.5 x 3.3 inch. Designed with precise and clear scale, the sliding is convenient, the drawing is stable, it is not easy to be skewed, can meet your different needs in daily use and is convenient for measurement. Flexibility & Rotatable: The circle at the top of the measuring template can be rotated which can help you easily draw circles with different radii. The short ruler below can also be moved up and down to facilitate drawing. In order to improve the accuracy of drawing, please draw with a thin pen tip. Multifunctional Ruler: These mathematics rulers not only can draw basic lines, circles, rectangles and triangles, but also can draw cylinders, cones, cubes, parabola, angular bisectors, vertical lines, etc. They can replace a variety of math drawing tools. Widely Used: A good tool for measuring or drawing, can exercise practical skills and imagination. Perfect for school teaching, designer drawing, and the drawing and measurement needs of engineers and tailors, helping to improve efficiency. It can be a gift for students, teachers, artists, and craft lovers.