1、Diamond Knurling Design: The edge of the frame with diamond knurling design, when loading and unloading the lens, comfortable grip without slippery. 2、CPL Filter To Eliminate Reflective Astigmatism: Can eliminate reflections on the surface of the object, so that the object in too bright environment to restore the original clarity texture and color saturation. Therefore, CPL filter is often used to eliminate the reflection of glass objects to eliminate stray light on the surface of the water and eliminate people's skin oil light, etc. 3、Imaging Grade Optical Glass: SLR lens grade glass, to ensure high definition image quality, hard and scratch resistant, while waterproof, oil resistant. 4、Double Sided Multi Layer Coating: Reduce the reflection of light between the lenses, the imaging is clearer and better image quality. 5、Waterproof And Anti Fogging: The frame has a built in rubber ring to effectively isolate water droplets and vapor, allowing you to create underwater, in the rain, wet, cold and other environments without worry. 6、Stronger Aluminum Alloy Frame: Aluminum alloy frame is reliable and durable, laser engraved text, no color loss, no fading, durable. 7、Applicable Models: The form factor is the same as the official protective mirror, seamlessly adaptable to official accessories, no need to worry about the compatibility with other accessories, compatible with for Insta360 GO 3. Item Type: CPL Filter Material: Aluminum Alloy, Silicone, Glass Weight: Approx. 28g / 1oz Compatible Products: For Insta360 GO 3 1 x CPL Filter 1 x Storage Box