Double Sided Multilayer Coating: Multilayer nano coating process, the lens has waterproof, oil, and scratch resistance, for your daily normal use to provide a guarantee. ND Filter: ND filter can reduce the amount of light in, enabling the camera to select the correct exposure value, prevent overexposure. Using coating dimming technology, to avoid the traditional ND mirror color bias problem, almost no color bias. Optical Glass Lens: The lens adopts high grade optical glass, HD grinding treatment, bring you better effect, is a nice choice for you to buy filters. Applicable Models: For Pocket 2 tripod head filter series, for your Pocket2, add special effects,more , helps you adjust the light, control depth of field. Magnetic Suction Installation: Magnetic suction installation, non destructive and fast installation, can be quickly replaced filter, for you to save time and experience, very suitable for your outdoor shooting needs.