1,Application: Tailored specifically for Insta360 Ace Pro action camera, this lens filter set provides more room for wonderful photography and clear recording of beautiful scenery. 2,ND Filter: The filter suppresses strong light environments, prevents overexposure, resists scattered light and increases color saturation, thus achieving a more transparent and vibrant image. This results in misty water, night light trails and other cinematic effects, with higher numbers indicating greater dimming effect. 3,Eliminating Non Metallic Reflection: The CPL filter enhances color saturation, increases image clarity and expressiveness, and restores true colors. It's perfect for photographing subjects behind glass, clear water, underwater, etc., giving a bluer sky and clearer water. 4,HD Coating: Each filter features double sided, multi layer coatings, reducing light reflection between the lenses. This leads to clearer imaging and superior picture quality. 5,Water and Fog Resistance: The filter frame contains a gasket that effectively isolates water droplets, allowing worry free creation in underwater, rainy, humid, and low temperature environments. 6,Knob Installation: The filter uses the same fixation method as the original lens. By using the provided wrench to twist off the original protective lens and install the filter, water, fog, and drop resistance performance is guaranteed to the highest degree.