Portable Storage Box: Magnetic absorption box equipped with soft sponge, fixed filter, easy to replace, can also store the original lens frame. Aluminum Frame: With aluminum alloy frame, lightweight yet sturdy enough to withstand wear and tear. It does not fade, prevents light leakage and ghost. Optical glass lens, clear image. ND Filter: Reduce the shutter speed in bright conditions and the amount of light entering the camera sensor, allowing you to the nature effect you want in your footage. ND Filters Set: The package contains ND8, ND16, ND32, ND64 filters, 4 lens filters can give you more freedom to adjust and provide more choices for shooting. Specifically designed to be compatible for DJI 3 PRO drone filter. Multi Layers of Nano Coatings: The filters feature multiple layers of nano coatings, which make the filter provide effective protection against dust, scratches, water, oil.