Features: Multi-layer coating, waterproof, oil-proof, and scratch-resistant performances. High-defination grinding optical glass lens, brings you clear images and restoring subjective viewing angle experience. Quality aluminum alloy material frame, durable and not easy to corrosion, quick design for easy installation. MCUV Filter: Suitable for shooting in seasides, mountain, snowfields and open areas, etc. It can reduce the blue tone caused by ultraviolets rays. CPL Filter: Eliminate unnecessary polarizing light to make the picture clearer, generally used for landscape photography. ND Filter: More freely to control apertures and the-shutters, bring more for creative space for photography, and effectively prevent overexposure. NDPL Filter: Can remove for glaration, increase saturation, improve contrast, make the image more three-dimensional and clear. Specifications: Material: Optical Glass+Aluminum Alloy Type: MCUV, ND4, ND8, ND16, ND32, ND4PL, ND8PL, ND16PL, ND32PL, CPL, 3pcs/set, 4pcs/set, 6pcs/set, 4pcs ND, 4pcs NDPL(optional) Applicable Model: for Air 3 Filter Set Instructions: Mixed filter set of 3 pieces: CPL+ND8+ND16 Mixed filter 4-piece set: MCUV+CPL+ND4+ND8 Mixed filter 6-piece set: MCUV+CPL+ND4+ND8+ND16+ND32 ND filter set of 4 pieces: ND4+ND8+ND16+ND32 NDPL filter set of 4 pieces: ND4PL+ND8PL+ND16PL+ND32PL Package Includes: 1x Lens Filter note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.