Flexible and unique design: the 180 measuring angle device is marked with equidistant lines for incubation; 2 clips are used to fix the paper; the square is drawn by the measuring angle device; all parts are detachable. [Material]: High-quality PS plastic, different from conventional plastic, light weight and durable. Specifications: A4; total dimensions: 49 x 35.5 x 1.3 cm/19.1 x 13.8 x 0.5 inches (length x width x depth)Includes: equipped with a clear sliding ruler drawn in centimeters, a 180 angle measuring device, an equidistant hatching line, a long guide plate, a quick release paper handle, a 45-degree square and 2 non-slip support legs. Features: This is a complete A4 drawing board workstation, with parallel motion, sliding in the groove, and locking in place with finger buttons at each end.