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 the reproduction of the image and achieve accurate color photography. 3. The aluminum frame is laser engraved with a matte , which has strong resistance and is not easily affected by factors such as humidity and oxidation. 4. Set design, and faster installation, can be firmly fixed on For PRO 2 during , with zero possibility of looseness. 5. It is compact and , making travel burden-free. Note: This filter is only suitable for cameras, please check the camera model before purchasing correctly, thank you! Specification:B:CPL ND8 ND16 ND32 Colour:Photo Color Material:Aluminum alloy + optical glass Package 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.