FREEWELL ND8 (3 f-Stops) ND0.9 Magnetic Quick Swap System Filter Neutral Density Optical Glass: Made of using the High Definition Premium Optical glass double-side multicoated Zero chromatic aberration (color shift) Function: ND8 (3 f-Stops) ND0.9 Neutral Density helps shoot long exposure photos or reduce shutter speed to create cinematic look while shooting outdoor What is Included: Empty Magnetic Base Ring, ND Filter, Lens Cap, Microfiber Cleaning Cloth, Magnetic Hard Case