1CPL Polarizer: Polarizer can eliminate harmful reflections, improve image clarity, and increase color saturation, such as sky, clouds, etc; Eliminate reflection from glass or water. 2Multi Layer Nano Coating: This product adopts a multi layer nano coating process, endowing the lens with strong waterproof, oil resisting, stain resisting, and scratch resisting performance. 3Anti Slip Gear: The frame has knurled patterns on the top and bottom, making it easy to install and disassemble. It will not damage the original lens during installation. After installing the filter, it will not affect the installation and use of the waterproof shell. 4Ultra Light Frame: It uses aviation aluminum frame material, which has no impact on shooting; It comes with a black matte finish frame to prevent light leakage and shadow generation; It uses optical glass lenses, which can be used for high definition imaging. 5Compatible with: This product is small in size, light in weight, and easy to carry; It has excellent performance and is suitable for 9 10 11 motion cameras.