Good Transparency: Navigation Parallel Ruler has good transparency and does not obscure too much information. Function: Designed to draw lines bearing line or course, the degree or amount of bearing line degree course line. Material: Made of premium acrylic sheet, high hardness and long service life. Precise Scale: The scale is engraved, accurate and easy to see. A good accessory for drawing and measurement Easy to Draw: Two hands each holding a ruler of David, alternately moved in parallel. Sturdy links provide the right amount of tension for drawing a line parallel to another line or reference point., Weight: 0.6834330122 Pounds, Manufacturer: Tuidzljd