XLKJ 30cm Rolling Parallel Ruler,Multi Purpose Measuring Ruler,Drawing Roller Ruler for Measuring,Drafting,Student,School

📐 High QualIty:Made of transparent plastic; It is light-weighted, easy to carry; Transparent material allows you to draw without ignoring some important figures or words. 📐 Design:Each centimeter has a circle hole for drawing circles and ellipses;There are various formulas on the roller, which can be calculated quickly in use. 📐 Function:A good helper for your work or study; It can help students develop their own manual skills as well as their imagination to draw different design pictures. 📐 Applications:Versatile measuring ruler, with a protractor to draw the desired figure, can also draw arc curve, horizontal parallel line, vertical parallel line, enough size for drawing. 📐 Note:This rolling ruler is only suitable for use on surfaces with relatively large friction such as drawing paper and canvas, and not suitable for use on surfaces that are too smooth.