37mm CPL/MCUV/ND4 Circular Polarizer, Multicoated Ultraviolet, Neutral Density 4 Filter Kit in Case High Quality Optical Glass CPL Circular Polarizer Filter Reduces glare in water and reflective surfaces, great for foliage in making leaves less shiny MCUV Filter Enhances Colors, Darken Blue Skies turning them into deep rich blues ND 4 Filter Increases control of depth of field and eliminates overly bright, washed-out images. Filters are Double Threaded and includes Filter Case and Cleaning Cloth