A graduated neutral-density filter, also known as a graduated ND filter, split neutral-density filter, or just a graduated filter, is an optical filter that has a variable light transmission. … These are used for special effects or to compensate for light falloff that is natural with large optics.
Wolverine Series. KW Toughened Optical Glass.
Nearly Unbreakable. 7 X Stronger than Normal Glass
IR-CUT Infrared cut-off coating Scratch resistant
Super Waterproof Mould Resistant Easy Clean
Optical Glass. No color cast
Fits Lee, Haida & Hitech, Cokin Z , Nisi etc 100mm holders.