*Description: -The included filter is made of HD optical glass with good transmittance.- Aluminum alloy frame seal ring can be installed better, prevent falling off or loosen.It has a better airtightness.ND Filter: -Effectively reduces the amount of light entering the sensor without affecting the color.(ND2 filters reduce exposure at one stop, ND4 reduces exposure at 2 stops, ND8 reduces exposure at 3 stops, ND16 filters reduce exposure at 4 stops) - Allows better control of camera aperture, exposure time and sensor sensitivity settings.You can create shallow depth than the field or achieve sharper photos.- ND filters provide a natural blurring in bright daytime situations to improve video quality by smoothing your video.Cleaning cloth and lens pen: -Can clean all lens surfaces and remove fingerprints and dirt.Filter Pouch: - Store lens filters and protect lens filters from dust, wobble and scratches.