SIRUI Ultra Slim S-Pro Nano MC Neutral Density Square Filter _x000D_ _x000D_ 1. SIRUI ND Square Filter - 2mm thickness can be used with SIRUI and other brands of 100mm filter holders._x000D_ _x000D_ 2. SIRUI Filter Holder (NDH-001, Spec: 100mm) lets you attach SIRUI ND Square Filters onto full-frame camera lenses as wide as 16mm and filter diameters up to 82mm. _x000D_ _x000D_ 3. German manufactured Schott Plate Glass B270 with exclusive lens coating process, allows many ultra-thin layers of coating to be placed on each glass surface to insure perfectly linear, uniform reduction of light from edge-to edge, maximum light transmission, reduced reflections and precise color rendition._x000D_ _x000D_ 4. Protection Coating (waterproof, oil-resistant, scratch-resistant, anti-reflective, anti-static) for easy cleaning and superior lens protection._x000D_ _x000D_ _x000D_ _x000D_ Model (Specification): _x000D_ Model ND0.9 ND1.2 ND1.8 ND3.0_x000D_ Spec. ND0.9(3Stops) ND1.2(4Stops) ND1.8(6Stops) ND3.0(10Stops)_x000D_ (Size: 100 x 100mm)