Features: High contrast linear polarizing film. High transmission of unpolarized light from 380~700nm. Make the study of light and color fun and memorable. for Ideal for a range of imaging applications, experiments involving birefringance, light scattering and more. Widely used in photography setups, science projects and learning physics. Specifications: Material: PVA Size: Approx. 10x10cm/3.94x3.94 inch Optical Type: High contrast transmissive Transmittance: single(42%) ; crossed(0.005%) Color: neutral gray Polarizing Efficiency: 99.99% 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