Optics: Pure High Definition Optical glass 18Layers Multicoated ensure filmmaking experience Built: Hard stop THREADED Variable ND eliminates any chance of cross-polarization & zero vignetting (16mm above) during the shoot Coating: Each side of the glass element is coated with Dustproof, Scratch-resistant, Oilproof making sure you are ready for all the adventures Function: 6-9 Stop equivalent to ND64-ND512 is best suitable for the bright day from normal sunny days to bright sunny days What is included: Variable ND Filter, Storage Case, One Lens Cover, Cleaning Cloth