Features:High contrast linear polarizer.High transmittance of unpolarized light from 380 to 700nm.Make the study of light and color fun and memorable.for Ideal for a variety of imaging applications, experiments involving birefringence, light scattering, and more.Widely used in photography settings, science projects, and studying physics. Specifications:Material: TAC+PVASize: Approx. 30x20cm/11.81x7.87 inchOptical Type: High contrast transmissiveTransmittance: single(42%) ; crossed(0.005%)Color: neutral grayPolarizing Efficiency: 99.99%Film Thickness: 150mPolarization axis: 50mmWavelength: 380~700nmThickness: 0.25mmDirection: linear Note:Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you order.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes:1x Polarized Film Sheet