Lens filters set: Multi-layer coating, waterproof, scratch-proof, dust-proof, oil-proof, protect for Insta360 ACE/ACE PRO lens from all-round damage. Meet the dual needs of ND filter and PL polarizing lens, and you can choose a variety of filter effects when shooting, including ND8/16/32 and PL filter Optical glass lens: Each filter is made of high-definition optical glass, which has no effect on image quality. After multiple grinding and polishing, it forms a low refractive index to ensure the restoration of the true color of the image for color-accurate photo shooting Aluminum alloy frame: The aviation-grade aluminum alloy frame is laser engraved with multiple oxidation finishes to prevent light leakage or ghosting, ensuring that each filter has been rigorously tested and will not add extra burden to your thumb camera or interfere with the normal shooting Easy installation: Quick installation, stable fixing, no need to worry about falling off during shooting With storage box: Comes with a filter box, which is convenient for storage and also protects the filter, making it easy to carry Specifications: Material: Aluminum alloy + glass Single Weight: 4.2g Size: 37x37mm