Polarized film：it have excellent polarization effects. Rotating the films experience polarizing effects at different angles Education：The non-adhesive polarizing filter is good for teaching physics,science demonstration, reusing, and using in photography to reduce glare Experiment：Polarizer filter permit experiments related to birefringence, light scattering, polarized light experiments, and light reflection Protective film: 7.8x11.8 inches (20x30 cm) polarized film sheet, 0.16 mm thick, has both side protective film, cut it to suitable shape. Tips: You need to tear off the protective film before use Premium Material：linear polarized film is crafted high-quality PET materials, serving to improve visual clarity and reduce glare on variety of surfaces, it yields exceptional durability and sustained performance. Please ensure to peel off the protective film from the polarizing film before use for a clear polarizing effect