The Cokin A series Net filters are available in white and black, grades 1 and 2, with #2 having the greater effect. 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 Black Net 2 is #145
Cokin White Net 1 is #142
Cokin White Net 2 is #144