Zykkor 77mm Pro Slim CPL - MC UV - ND 0.6 Filter Kit with Deluxe Pouch Pro Slim filters - multicoated MCUV / CPL / ND 0.6 (otherwise knows as ND4 or 2-fstop) made from high quality optical glass New slim filter frame designed to help avoid vignetting with lenses as wide as 10mm in the 35mm format MC UV and ND filter are only 3mm thick, CPL filter has extra 2.75mm base All filters (even CPL) are double-threaded, they have a regular frontal thread, which allows a regular snap-on lens cap or other filters to be stacked on top Supplied in high quality deluxe four filters ballistic nylon pouch with mesh pockets and no-scratch lining