Product contentsYou will receive 2 pieces goniometers, 4.5 cm wide, 18 cm long when folded and can be extended to 36 cm when unfolded. Robust and durable: Made of PVC material, it is sturdy and durable, not easy to break, and the surface is smooth, but it does not slip out of your hand when you hold it. The edges are rounded and do not scratch the hands and can be used for a long time. Clear scale: the transparent design and clear scale allow you to easily and quickly identify it without obstructing your view and easy to use. After use, it can be put in the matching zip pocket, and the zip pocket can also be used for storing stationery, notebooks, etc. 360 - The two rulers are combined into one that can be rotated 360 when open, which meets your daily measuring and painting requirements and is a good help for your work. Widely used: It can be used for different angle measurements, e.g. for measuring elbow joint, knee joint or spine, and can also be used for architects, artists, designers, teachers, engineers, students and other people with drawing needs. The goniometer can bring you convenience.