Formatt Hitech 85x85mm (3.35"x3.35") Neutral Density 0.9 (3 stops) for Formatt Hitech 85mm modular holder Cokin P System compatible with all 85mm holder systems 3 stop (0.9) standard ND filter Reduces light by 3 F-stops across the whole image Made in the UK in rugged and durable CR39 resin Compatible with Formatt Hitech 85mm, Cokin P size and all other 85mm systems Enables use os slower shutter speeds, decrease of depth of field, decreasing of effective ISO