Feature: 1. Applicable Model: The ND neutral density and CPL circular polarizer lens filter kit is suitable for 9 10 11 action camera. 2. ND Filter: ND filter can reduce the amount of light input, reduce the shutter speed, and prevent overexposure. It adopts a coating dimming process, almost without color deviation. 3. CPL Filter: CPL filter can eliminate harmful reflections, improve image clarity, and increase color saturation, such as blue sky, white clouds, etc. It can liminate reflection from glass or water surface. 4. Multi Layer Nano Coating: Adopting a multi layer nano coating process, the lens is endowed with waterproof, oil resistant, stain resistant, and scratch resistant performance, providing protection for your lens. 5. Anti Slip Gear Design: The filter frame has knurled patterns on the top and bottom, making it easy to install and disassemble. During installation, the original lens will not be damaged, and the filter can be replaced at any time to prevent you from missing out on exciting moments. After installing the filter, it will not affect the installation and use of the waterproof shell. 6. Ultra Light Frame: Made of aviation aluminum frame material, it has no impact on shooting, is tight, durable, and has a long service life. The black matte surface frame prevents light leakage and ghosting. Optical glass lens, precise grinding and polishing, high definition imaging Specification: Item Type: ND CPL Filter Material: Aluminum Alloy, Optical Glass Applicable Model: for 9 10 11 Action Camera Weight: Approx. 65g / 2.3oz. Package List: 4 x Filter 1 x Storage Box 1 x Wiping Cloth Note: Cleaning instructions:If the lens is contaminated with dust, water droplets, or other pollutants, whether or not they have been removed, please remember the following usage methods.1. First blow off the dust on the surface of the lens;2. Clean again with a clean brush;3. Gently wipe with the delivered filter cleaning cloth;4. The use of specialized lens cleaning solution has a more ideal effect;5. Store it in a dedicated storage box when not in use.