The 77mm NanoPro Magnetic Filter Kit from Haida features a circular polarizer filter and two ND filters, all magnetic. A magnetic adapter ring is included that screws onto 77mm front filter threads of compatible lenses. With the adapter ring attached, you can magnetically mount and swap the CPL and ND filters. A 72-77mm magnetic step-up ring is included. With the magnetic adapter ring and this step-up ring in your toolkit, you can work with both 72mm and 77mm lenses. The kit is complete with a magnetic lens cap and a filter case.