1. Optical glass, precision 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 will not fade 5. adjustable, by rotating the gear can adjust the light, choose the right luminosity for Installation will not damage the lens, change the filter at any time, do not let you miss the wonderful moment. Cautions: 1. filters cannot be expressed in terms of light transmission 2. only filters are adjustable, other filters are not. Type:B:+ND8PL+ND16PL+ND32PL+ND64PL+ND128PL Colour:Black Material:Aluminum alloy + tempered glass Package Contents: 6 x 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.