1. The Rubber ring inside the frame effectively isolates water droplets and moisture, protecting your lens from damage in underwater, rainy, and humid environments.2. Each filter is made of high-definition optical glass, which has no impact on image quality. After multiple grinding and polishing, it forms a low refractive index to ensure the true color reproduction of the image and achieve accurate color photography.3. The aluminum frame is laser engraved with a matte finish, which has strong corrosion resistance and is not easily affected by factors such as humidity and oxidation.4. Set design, safer and faster installation, can be firmly fixed on For Insta360 ACE PRO 2 during shooting, with zero possibility of looseness.5. It is compact and lightweight, making travel burden-free.Note: This filter is only suitable for Ace pro2 cameras, please check the camera model before purchasing correctly, thank you!Colour:Photo ColorMaterial:Aluminum alloy + optical glassSpecification:A:ND8 ND16 ND32 ND64Package Contents:4 x Lens Filter(One each for ND8/16/32/64)Specification:B:CPL ND8 ND16 ND32Package Contents:4 x Lens Filter(One each for CPL/ND8/16/32)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.