Features: The Size of It: About 22.5x21cm/8.85x8.26inch. There are 360-degree graduation lines printed on it. It consists of an analyzer, a polarizer and a base, are made of quality materials. With a diameter of 205mm, a thickness of 3mm, and a polarization diameter of 160mm. Operation Method: Place the two films on the base and rotate the polarizer to observe the polarization phenomenon of the analyzer. You can also turn ones of the films against the computer screen or LCD TV to observe the magical effect. Specifications: Material: Plastic Color: As The Picture Shows Package Weight: approx.300g Size: approx.22.5x21cm/8.85x8.26in Package Includes: 1Pc x Polarizer Light Polarization Demonstrator note: Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks!