1. Optical glass, grinding and polishing, high-definition imaging, 2. double-sided multi-layer nano-coating process, restore the true colour, 3. Double-sided waterproof, oil-proof, for your lens protection, 4. aviation aluminium frame material, logo engraved by laser engraving not fade, 5. Installation not damage the your lens, change the filter at any time, do not let you miss the wonderful moment. Specification:A:ND8+ND16+ND32+ND64 Color: As Shown Material: Aluminum Optical Glass Package Contents: 1set x drone filter 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.