The cokin a series net filters are available in white and black grades 1 only the black net filter softens fine details with no change in contrast while the white net filters not only soften details but also lower contrast this filter measures 66 x 72mm and fits the cokin a series holder cokin net filter chart cokin black net 1 is 143 cokin white net 1 is 142 lowers contrast softens detail adds a white haze to the image