Features: OOTDTY new and high quality Wide Applications: Versatile measuring ruler, with a protractor to draw the desired figure, can also draw arc , horizontal parallel line, vertical parallel line, enough size for drawing. More Details: Each centimeter has a circle hole for drawing circles and ellipses; This drawing ruler is built in roller, clear scale, easy sliding, stable drawing, not easy to skew, clear scale, easy to observe; There are various formulas on the roller, which can be calculated quickly in use. Multiple uses: Whether you are an artist, student, pattern maker or designer, this measuring rolling ruler is 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. Quality material: Our measuring ruler tool is made of transparent plastic; It is light-weighted, easy to carry; Transparent material allows you to draw without ignoring some important figures or words. Different Size: The ruler has different two sizes, which will full fill with your different needs. You can choose it base on your situations. Specifications: Material: Plastic Type: 15cm/30cm Size: Approx. 5.9/11.for inches Package Includes: 1x Parallel Rolling Ruler Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. _x000D_