BiG DIGITAL Complete ND Neutral Density Filter Set, Compatible with Cokin P Series, Includes: Graduated ND2, ND4, ND8, and Full ND2, ND4, and ND8 Filters + square filter holder + square lens hood + nine sizes adapter rings+ six pocket wallet style case for the filters, compatible with all of the following lens thread size: 49mm 52mm 55mm 58mm 62mm 67mm 72mm 77mm and 82mm. Filter System is made for photo and video cameras. The filter is placed in front of the camera lens to modulate the quantity of light that reach the sensor in order to modify colors, contrast, saturation, shutter-speed, depth-of-field and such parameters. This is a Complete ND set includes: Graduated ND2 ,ND4, ND8 filters. Full ND2, ND4, ND8 filters, one square filter holder, one square lens hood, nine sizes adapter rings: 49mm 52mm 55mm 58mm 62mm 67mm 72mm 77mm and 82mm to fit most lenses. This kit also includes a six pocket wallet style case to hold the ND filters. These filters are compatable with the Cokin P series. ND filters reduce the amount of light reaching the film without affecting the color. BiG Digital brand.