1.optical glass, precision polished and polished for high definition imaging, 2.multi-layer nano-coating process, giving the lens high quality waterproof, oil-proof, dirt-proof and scratch-proof performance, 3.aerospace aluminium frame with laser-engraved logo and matte black frame to prevent ghosting, 4.storage case for the set of filters, with a soft sponge inside to hold the filters in place so that they do not fall out, allowing you to carry them far, 5.The top and bottom of the filter, as well as the left and right side, are equipped with clips for easy installation and are less likely to fall out when flying. Cautions: 1.Lenses in colour depending on the angle of light. 2.the installation and disassembly will touch the lens and leave fingerprints, use a cleaning cloth to wipe the lens. 3.ND light filter can reduce the amount of incoming light, lower the shutter speed, prevent overexposure, also can resist scattered light, improve the color saturation of the picture, you can clouds, silky flowing water, empty streets. Commonly used in street scenes/natural scenery/tourist attractions/ special effects 4.CPL polarizer can harmful reflections, improve the clarity of the image, increase the contrast of light, color saturation, such as blue , white clouds, etc., so that the color is more vivid. Note: Drone are not included. Due to different batches, there may be differences in product appearance and printed text, which will not affect use Colour:Black Material:Aluminum + optical glass Package Contents: 3 x Lens Filter(CPL+ND8+ND16) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.