1.optical glass, precision and 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. aluminium frame with laser-engraved logo and black frame to prevent ghosting, 4.a magnetic storage case for the 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.Only UV filters can transmit 98.5% of light, /NDfilters cannot be expressed in terms of light transmission. 2.Please note that the single product is in a plastic storage box and the set is in a magnetic storage box (individual filters are not in a magnetic box). 3.Lenses in colour depending on the angle of light. 4.the installation and disassembly will touch the lens and leave , use a cleaning cloth to wipe the lens. Quantity:B:6 Colour:Black Material:aluminum Optical glass Package Contents: 6 x Filter(UV++ND16+ND8+ND32+ND64) 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.