Bundle Includes: NiSi 77mm True Color ND-VARIO Pro Nano 1-5 Stops Variable ND Filter, and Hard-Shell Filter Case (Fits 8 Filters up to 95mm) Construction: Nano coating, waterproof and anti-reflective coating Density: The 0.3 to 1.5 density creates a darkening of the entire image, allowing wider apertures or slower shutter speeds than usually possible Smooth Transition: The transition of density occurs smoothly which allows the photographer or videographer to adjust exposure length to the exact amount required for a given scene Easily Controllable: The degree of density is easily controlled by rotating the silver knob