You can draw the desired graphics with a protractor, or you can draw arc curves, horizontal parallel lines, and vertical parallel lines. There is a round hole per centimeter for drawing circles and ellipses. And the scale is clear, easy to slide observation, not easy to skew. Whether you are an artist, student, pattern maker or designer, this ruler is a good helper for your work or study. It can help students develop their hands-on ability and imagination to draw different designs. Scale color: Black Weight: 32 grams colour:Transparent Material:plastic Package Contents: 2 x Measuring ruler Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.