1、Clear Scale: Every centimeter has a round hole for drawing circles and ellipses, built in roller, clear scale, easy to slide, not easy to skew, easy to observe. 2、Applicable People: There are various formulas on the roller for quick calculation in use, whether you are an artist, student, pattern maker or designer, this measuring tape is a good helper for your work or study. 3、Scope of Application: Universal measuring tape, with the protractor to draw the required graphics, can also draw circular curves, horizontal parallel lines, vertical parallel lines, enough size drawing. 4、Plastic Material: Roller ruler is made of clear plastic, light weight and easy to carry, it can help students develop their craft skills and imagination. 5、Perfect Gift: The plastic ruler is an ideal gift for friends, family and artists, the practical tool can bring them a lot of convenience and further enhance their creativity.