1、ND Filter Performance: A ND filter can reduce shutter speed, extend exposure time, eliminate reflections, increase saturation, and provide more creative space for photography. It is an ideal choice for professional photography. The number after ND represents the dimming ability. 2、High Definition Optical Glass: High definition grinding processing, high light transmittance, providing high definition pictures without affecting image quality or increasing color deviation 3、Scope of Application: This 100x100mm square ND filter is not directly screwed onto the lens and can be used for lenses with various focal lengths. 4、Ultra Thin and Light: The ND filter has a thickness of 2mm, which is ultra thin and lightweight, and hardly adds significant weight to your shooting setup when installed. 5、Multi Layer Coating: This 100x100mm square ND filter is multi layer coated with anti scratch, waterproof, and oil resistant functions. 6、Storage Box: Comes with a storage box for easy storage and carrying, and can be easily placed in a backpack or luggage at any time. Item Type: 100mm ND Filter Material: Optical Glass Weight: Approx. 106g / 3.7oz Coating: Multi Layer Coating Product Size: Approx. 100 x 100mm / 3.9 x 3.9in Product Thickness: Approx. 2mm / 0.08in 1 x Square Filter 1 x Storage Box