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: TACandPVA Size: Approx. 30x20cm or 11.81x7.87 inch Optical Type: High contrast transmissive Transmittance: single(42 percent ) crossed(0.005 percent ) Color: neutral gray Polarizing Efficiency: 99.99 percent Film Thickness: 150m Polarization axis: 50mm Wavelength: 380-700nm Thickness: 0.25mm Direction: 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 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.