This Cokin P Series 0.3, 0.6, and 0.9 ND Filter Kit contains three filters that can be used individually or in various combinations to create a darkening of the entire image, allowing you to photograph with a wider aperture or slower shutter speed than normally required. By increasing your aperture or slowing your exposure time, you can control depth of field and convey movement more easily. Neutral density filters do not affect the coloration of the image and are ideal for pairing with other filters. The included filters consist of 84 x 84mm solid neutral density filters that reduce the amount of light entering a lens by 1, 2, and 3 stops, respectively. To allow these filters to be placed in front of a lens, a separately available Cokin P Series filter holder and a Cokin P Series lens adapter ring are required. Each filter is made of durable, optical resin (CR39) and measures 1.6mm thick. What's in the box 1 x Cokin Full ND2 Filter 1 x Cokin Full ND4 Filter 1 x Cokin Full ND8 Filter 3 X Fabric Filter pouches Limited 1-Year Warranty (P Series filter holder and Cokin P Series lens adapter ring NOT INCLUDED)