Features: l Aluminium alloy frame is sturdy and durable, no colour loss, no fading l Laminated rubber ring, waterproof and anti-fogging, shooting underwater humidity, low temperature and other environments at will l Threaded knob mounting for guaranteed protection, for a tighter fasten l 1.5mm extra-thick glass lens, anti-drop, anti-collision and high water pressure resistance l Double-sided multi-layer scratch-proof coating, reduce the light reflection between lens, ans thus displaying higher resolution and generating higher quality images l With twill knurled design, the edge of the filter is easy and friendly for hand pinching in mounting l Reduce light hitting and prolong the time of exposure l Perfect fit for DJI Osmo Action 4 sports camera Specification: l Material: Aluminium Alloy + Glass l Types (Optional): UV, CPL, ND8+16+32+64, ND8+16+32+CPL l Size: Φ32.4x6.9 (mm³) l Applicable Model: for DJI Osmo Action 4 Sports Camera Package: l 1x UV Or l 1x CPL Or l 1x ND8+16+32+64 Or l 1x ND8+16+32+CPL Note: l Does not include the DJI Osmo Action 4 sports camera.