The Cokin Speed filter adds streaks of light to give you the impression that something is rushing by at high speed. Your subject does not need to be moving. When the filter is used, part of the image will appear to remain stationary while the rest will appear "blurred" as if rushing by. It is recommended that you do not stop your lens aperture down too far. Otherwise, you will see the filter rather than the effect.
This filter measures 66 x 72mm and fits the Cokin A series holder.