1、Optical Glass: Accuracy grinding and polishing, high definition imaging; Designed for Osmo Action 4, you can choose depending on your device model. 2、Multi Layer Nano Coating Process: The use of multi layer nano coating process, giving the lens waterproof, anti oil, anti scratch properties. 3、Easy to Install and Disassemble: Aviation aluminum frame material, dark gray frame to prevent light leakage and ghost; Anti slip gear design, knurled above and below the frame, easy to install and remove. 4、Replace the Filter at Any Time: The original lens will not be damaged during installation, and the filter will be replaced at any time, so that you will not miss the wonderful moment. 5、Filter Set: The lens is made by the nano coating process, and the color of the lens is different in the sunlight and light. Item Type: Action Camera Filters Weight: 65g/2.3oz Material: Aluminum alloy and optical glass 1 x UV Filter 1 x CPL Filter 1 x ND16 Filter 1 x Storage Box 1 x Cleaning Cloth