Design: This features a roller and a ruler that you can move conveniently and accurately to make sure that drawing will be quick and efficient. Precise Scale: Clear scale for easy reading, the parallel ruler has high accuracy and easy to use. Function: With this parallel roller ruler, your drafting work will be much more easier and efficient. Portable: Light weight, smooth and easy to draw, with clear scale, the parallel ruler is easy to observe. High Quality: The parallel ruler is made of high quality PVC plastic with long service life. Delivery Quantity: 1pc, Package Contents: Only the above package contents, excluding other products. Size: length 30cm (Reminder: The size is measured manually, please allow 1-2 cm measurement error) color: White (Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)