Features: Optical glass, precisions grinding and polishing, high-definition imaging. Adopting double-sided multilayer coating technology to restore real color. Double sided oilproof and waterproof, providing protections for lens. Made of aviation aluminum frame material, engraved without fading, and the black frame prevents light leakage and ghosting. CPL is adjustable, and the light can be adjusted by rotating the gear to select the appropriate brightness for shooting. During installation, original lens will not be damaged, and the filter can be replaced at any time to prevent you from missing out on exciting moment. Specifications: Material: Aluminum Alloy (frame)+Optical Glass Packing Size: Approx. 6.4x6.4x2cm/2.51x2.51x0.78inch Process: waterproof, multilayer coating Type: UV, CPL, ND8, ND16, ND32, Anti-light(optional) Applicable Model: for AIR 3 Note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution. Package includes: 1 Piece Lens Filter