Rotring A3 drawing board is a robust board of unbreakable, non-warping material for durability, it has Parallel straight-edge with stop-and-go locking mechanism, Guide rails, compass plotting, rapid set square and media markings designed for aiding in accuracy and two magnetic clamp strips with central pushbutton operation and corner clamp for easy and secure hold. An Ergonomic design for easy and comfortable working. A quality durable product made in Germany.