Features: brand new and high quality EXCELLENT CHOICE. A useful and practical measuring tool for artists, designers, architects, engineers, students, teachers and so on. Compact and portable. for Ideal for classroom, school, office, home, etc. MULTIFUNCTIONAL. Three different size circle holes for drawing various circles and ellipses; With built in roller which clearly printed mathematical formula and trigonometric function table. Easy to view. Clear scale, easy sliding, stable drawing, not easy to skew. PREMIUM&DURABLE. made of top-touch plastic material. It is light-weighted, easy to carry. Transparent deisgn allows you to draw without ignoring any important figures or words. PROFESSIONAL PARALLEL RULER. This premium 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, in a length of 12 inches/ 30 for cm. WIDELY USE. for Ideal for artists, students, pattern makesr or designers, architects and more. This measuring rolling ruler is a good helper for your work or study. Specifications: Material: Plastic Size: 30cm/11.81in Weight: Approx. 25g Package Includes: 1 Piece Clear Parallel Ruler note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!