Educational Application: Work great for class projects to demonstrate the effects of polarization in a very affordable way. Physical Experiment: Linear Polarizing sheets are used in experiments relating to birefringence, light scattering, polarized light experiments, light reflection. Photography Filter: Use to reduce the caused by smooth surfaces such as glass, water, paper, and certain metallic objects. Colour:Black Material:TAC+PVA Size:About:30x20cm, Thickness:0.16mm Package Contents: 3 x Polarizing Film Sheet Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store