No colour cast: True colour polarising filter uses a titanium coating technology to ensure that the video recording process effectively solves the problem of yellowish images and restores the true colours of the screen. CPL filter function: with polarising filters, you can use unwanted reflections from non-metallic surfaces such as water, glass, etc. Can also improve colour contrast and saturation, especially in blue sky and white clouds. Multi-coating: made of high-quality Japanese optical glass with 28-layer nano coating on both sides, HD, waterproof, oil and scratch-resistant, anti-fog and reduced reflection. CNC frame: the surface of the mirror frame is designed with a CNC trapezoidal pattern, which increases rotation friction and is convenient for installation and removal. Hign-concerned Chemical:none Type:Polarizer Filter Colour:As Shown Material:Optical Glass Size:49mm Package Contents: 1 * Polarizer Filter 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.