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+PVA Size: Approx. 30x20cm/11.81x7.87 inch Optical Type: High contrast transmissive Transmittance: single(42%) ; crossed(≦0.005%) Color: neutral gray Polarizing Efficiency: 99.99% Film Thickness: 150μm Polarization axis: 50mm Wavelength: 380~700nm Thickness: 0.25mm Direction: linear Package Includes: 1x Polarized Film Sheet 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.