Features: The aluminum alloy frame is reliable and durable, with laser-engraved text that does not fade The mirror frame edges feature a diamond knurled design, providing a secure grip and helping prevent slipping during lens installation and removal Double-sided multi-layer coating reduces light reflection between lenses, resulting in clearer imaging and improved image quality SLR lens-grade glass ensures high-definition image quality, is sturdy and scratch resistant, and offers water and oil resistance Frame includes built-in rubber rings that effectively isolate water droplets and vapor, enabling reliable performance in underwater, rainy, humid, and low-temperature environments Overall size matches the official protective mirror, allowing seamless compatibility with original accessories Specifications: Filter Types: ND8, ND16, ND32, ND64, UV, CPL Material: Aluminum Alloy + Glass Quantity: 1 Piece Filter Compatible with Insta360 GO3 Camera Size: approximately 19.0 x 4.7mm Note: Due to lighting effects and shooting angles, slight variations in product appearance may occur Allow 0-1cm size variation due to manual measurement Package includes: 1 Piece Lens Filter