Features: Ptical glass, precision- polished- and polished- for high definition imaging, Multi-layer nano-coating process, giving the lens high quality waterproof, oil-proof, dirt-proof and scratch-proof performance, Aerospace aluminium-frame with laser-engraved pattern and matte-black frame to prevent ghostings, A magnetic 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, The top and bottom of the filter, as well as the left and right side, are equipped with clip for easy installation and are less likely to fall out when flying. Specifications: Material: Aluminium-(frame) and Optical glass Applicable models: for Avata or O3 Air Unit Type:UV, CPL, ND8, ND16, ND32, ND64(optional) Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Filter