1、Neutral Density Lens: ND lens can reduce the amount of light, avoid overexposure, but also can resist the scattered light, improve the color saturation of the picture, make the picture more transparent and gorgeous, you can reduce the shutter speed through the reducer when shooting video. 2、Coating Process: The multi layer nano coating process is adopted to give the lens waterproof, anti oil, fouling proof, anti scratch properties, and the colors of the lens is different under sunlight and light. 3、Aviation Aluminum Alloy Frame Material: The frame is fine engraved, does not fade, dark gray frame can prevent light leakage to produce ghost images. 4、Anti Slip Gear Design: Knurled pattern is set up and down the frame, easy to install and disassemble; Installation will not damage the original lens or affect the use of waterproof shell, change the filter at any time, do not let you miss the wonderful moment. 5、Applications: These action camera neutral density filter are designed to fit for DJI Osmo Action 3, 4pcs help you add special effects to your camera. 4 x ND Filter1 x Cleaning Cloth1 x Storage Box Item Type: Action Camera ND FilterMaterial: Aluminum alloy, optical glassWeight: Approx. 71g/ 2.5ozApplicable Model: for DJI Osmo Action 3