Knurling Design: The edge of with knurling design, when loading and unloading the lens, comfortable grip without slippery. Double Sided Multi Layer Coating: Reduce the reflection of light between the lenses, the imaging is clearer and better image quality. CPL Filter To Eliminate Reflective Astigmatism: Can eliminate reflections on the 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 of the water and eliminate people's skin oil light, etc. Stronger Aluminum Alloy Frame: Aluminum alloy frame is reliable and durable, engraved text, no color loss, no fading, durable. 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.