Note: The lens is NOT included; Only lens with 52MM lens thread size can use with these filters; Please verify that the size of your lens is ? 52MMDescription:The included filters are made of HD optics glass that have good level of transmittanceAluminum alloy frame sealing ring makes it have better tightness, which can avoid fall or looseNeutral Density ND Filter:ND filters reduce the amount of light reaching the film without affecting the color (ND2 Filter reduces the exposure by 1-stop; ND4 reduces the exposure by 2-stops; ND8 reduces the exposure by 3-stops; ND16 Filter reduces the exposure by 4-stops)ND filters allow you to have more control of the camera's aperture, exposure time and sensor sensitivity settings, which can produce a shallower depth of field, or achieve a sharper photoND Filters also help improve video quality by introducing a natural motion blur for smoother motion in video in bright daylight situationsLens Pen:They can be used for cleaning all lens surfaces and removing fingerprints and more serious dirtFilter Pouch:It is convenient to store your lens filters, protecting your lens filter from dust, shake and scratchesPackage Contents:1 x ND2 Filter1 x ND4 Filter1 x ND8 Filter1 x ND16 Filter1 x Lens Pen1 x Filter Pouch