Features: Compared to other similar products-on the market, the scale of the glasses protractor is clear and accurate, and the-pointer swings flexibly. It is the eyewear protractor that is designed with hand pinch-groove, which enables it easy to take. And more, it also has the advantages of lightweight and compact-size. It is constructed of plastic material. The length of this product is 7cm, width is 7cm and height is 1cm. This product is perfectly suitable for home, household, dorm, office, etc. Specifications: Material: Plastic Size:Approx.7x7x1cm/2.75x2.75x0.39inch Package Includes: 1x Glasses Protractor note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. ②.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.