1. 1.5mm thickened glass lens, upgraded protection, anti-scratch and anti-drop, thickened and anti-collision 2. After installation, the frame is tightly compressed with the waterproof rubber ring on the host, and the inner cavity of the lens is effectively isolated from water vapor 3. Aluminum alloy frame, sturdy and durable, laser engraved text, no color loss, no fading 4. Double-sided multi-layer coating, reduce the reflection of light between the lenses, clear imaging 5. Does not block the host lens field of view, the shooting screen transparent without dark corners 6. Adopting the same thread design as the original lens, after unscrewing the original protective lens, then screw to install the filter, waterproof, anti-fog, drop-proof 7. Mirror frame edge using twill knurling design, when loading and unloading lenses, hand pinch comfortable non-slip 8. ND filter, light reduction and long exposure 9. CPL polarizer, restore the original color of the wonderful 10. Material: aluminum alloy + glass 11. Size: about 32.4 x 6.9mm 12. Weight: about 7.5g 13. Description: only the filter, does not include other items in the picture