1、Multilayer Nano Coating: Adopting a double sided multi layer nano coating process, the lens is endowed with waterproof, oil resistant, and scratch resistant performance, providing protection for your lens. 2、ND Filter Material: The ND filter for Mini 3 is made of aviation aluminum frame material, with a sign that is laser engraved and does not fade. The black matte surface frame prevents light leakage and ghosting. 3、Multi Gear Adjustment: After installing the filter, the gear of the filter can be rotated according to the needs of the scene to adjust the gear position, avoiding the tedious steps of disassembling and disassembling the filter. 4、Easy to Install and Disassemble: During installation, the original lens will not be damaged, and the adjustable ND filter for Mini 3 Pro can be replaced at any time to prevent you from missing out on exciting moments. 5、Storage Box and Cleaning Cloth: A storage box specially designed for filters, soft sponge, fixed filter, earthquake resistant and moisture proof, dustproof cleaning cloth, easy to wipe off dust, water stains to keep the lenses clean. Item Type: Adjustable ND Filter for Mini 3 Pro Material: Aluminum Alloy (Frame), Optical Glass Product Color: Black Weight: Approx. 25g / 0.9oz Product Size: Approx. 21x17mm / 0.8x0.7in Applicable Models: for Mini 3, for Mini 3 Pro 1 x Adjustable ND Filter 1 x Cleaning Cloth 1 x Storage Box