Geometric Ruler:Multi functional geometric ruler, suitable for artists, students, graphic makers, and graphic designs . Drawing Ruler: The color of the ruler is transparent and will not affect drawing on white paper . Creative Design: Rotating dot design allows you to easily draw a small circle. There are some rotating dots on the ruler and you can draw circles with different pattern . Perfect Gift: geometric drawing ruler for students, teachers, artists, woodworking, tailor and craft etc . Multifunctional Ruler: Can , Circles, Rectangles, And Triangles, Also Draw Cylinders, Cones, Cubes, Parabolas, Golden Sections, Bisectors, Vertical Lines Etc .