JINYI Teaching Compass, Plastic Compass Drawing Math Geometry Tool Teacher Aids, Large Circle on School Classroom Whiteboard Chalkboard Stationery With Suction Pad: The suction pad within the joint helps to lock the dividers in place to ensure accuracy while drawing. Material: Made from durable plastic which allows it to handle numerous drops and years of use in the class setting. Application: Perfect for teaching a class when using a whiteboard or chalkboard. Easy To Adjust: can hold markers or chalk with ease. Suitable For: Made for mathematical geometry and art drawing. especially for repeat measurements or drawing arcs and circles. Color: orange blue Size: length 455* width 75mm Delivery Quantity: 1 Piece Warm prompt: 1.As different measuring methods,it will occur 1-3 cm deviation about the items,please ensure that it is okay for you before ordering. 2. Because of different monitors and lamplight, the picture may not reflect the actual color of the item, really thank you for your kind understanding 3. Only the above package contents, excluding other products.