Feature: 1. The lens frame is made of aero‑grade aluminum alloy with CNC precise machining and anodized surfaces treatment. 2. Easy to install and remove, with high definition optical glass production, strong and durable in use. 3. The GND filter is mainly used for exposure balancing. When the sunlight is strong and the contrast with the ground is large, this filter can reduce the amount of light entering the upper part of the lens to avoid situations where the sky is too white or the ground is too gray. 4. Adopt double‑sided multilayer nanometer coating process, waterproof, scratch‑proof and oil‑proof, make the lens surfaces form a protective layer that prevent water‑drop and oil can not absorb the surfaces, easier to clean and maintain. 5. Designed for GOPRO HERO9 motion camera, the lens protective cover replacement filter gives you better night shooting effect. Specification: Condition: 100% Brand New Item Type: GND Filter Material: Aluminum Alloy + Optical Glass Color: Black Product Size: Approx. 32x32x5 mm/1.3x1.3x0.2 inWeight: Approx. 46.0g Package List: 1 x GND Filter Note: 1. Please allow 1‑3cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.