Feature: 1. Diamond Knurled Design: The edge of the frame adopts diamond knurled design, which makes the handling of the lens comfortable and does not slip. 2. ND Filter Light Reduction Long Exposure: The main function of ND filter is to reduce the amount of light in the lens and reduce the overexposure of the screen; And can lengthen the camera exposure time, make the riding picture more speed, the water becomes as long as silk, and the sky and clouds are more dynamic. 3. Imaging Grade Optical Glass: Single lens reflex camera lens grade glass to ensure high definition picture quality, hard scratch resistant, waterproof, oil resistant. 4. Double Sided Multilayer Coating: Reduce the light reflection between the lenses, the image is clear and the picture quality is better. 5. Waterproof and Anti Fog: The built in rubber ring of the frame can effectively isolate water droplets and water vapor, so that you can create worry free in underwater, rain, humidity, low temperature and other environments. 6. Aluminum Alloy Frame More Robust: Aluminum alloy material frame reliable and durable, laser engraving text, do not fade. 7. Applicable Model: The size is consistent with the official protective mirror, can be seamlessly adapted to the official accessories, do not need to worry about the compatibility with other accessories, compatible for GO 3. Specification: Item Type: Action Camera ND Filter Weight: 28g/0.99oz Material: Aluminum alloy and silicone and glass Adaptation Product: for GO 3. Package List: 3 x Filter1 x Storage Box