Material: Made of premium acrylic sheet, high hardness and long service life. Function: Designed to draw lines or course, the degree or amount of degree course . Precise Scale: The scale is , and easy to see. A good accessory for drawing and measurement Good Transparency: Navigation Parallel Ruler has good transparency and does not obscure too much information. Easy to Draw: Two hands each holding a ruler of David, alternately moved in parallel. Sturdy links the right amount of tension for drawing a parallel to another or reference . Material: acrylic fiber Color as shown Package Contents: 1 pcs Parallel Ruler Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin