The Cokin X-Pro Series Filter Holder is designed to accommodate multiple Cokin X-Pro Series Filters in order to help create the shot you envision. It can hold up to two rectangular filters, or one rectangular filter and one round filter such as a rotating circular polarizer, for the Cokin X-Pro Series Filter Holders.
Rectangular Cokin X-Pro Series Filters are 130mm wide and 3mm thick. A Cokin X-Pro Series Filter Holder Adapter Ring can be used to connect this filter holder to the front of a lens.