Features: The aluminum alloy frame is reliable and durable, with laserengraved text that does not fade The mirror frame edges adopts a diamond knurled design, making it comfortable to grip and prevent slipping when loading and unloading the lenses. Double sided multi-layer coating reduces light reflection between lenses, resulting in clearer imaging and better imagequality. SLR lens grade glass ensures high-definition imagequality, is sturdy and scratch resistant, while also waterproof and oil resistant. Frame is equipped with built-in rubber rings, effectively isolating water droplets andvapor, allowing you to create worry free environments such as underwater, rainy, humid, and low temperatures. The overall size is consistent with the official protective mirror, and it can seamlessly adapt to official accessories without worrying about compatibility. Specifications: Filters Types：ND8 ND16 ND32 ND64 UV CPL Material：AluminumAlloy+Glass Quantity：1PC Filter for Insta360GO3 Camera Size：approx 19.0x 4.7mm/0.75x0.067in Package Includes: 1 PC Lens Filter note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment