Feature: 1. STRONG MATERIAL: The ND CPL filter set is made of optical glass with accurate grinding and polishing for high definition imaging. Aviation aluminum frame material, engraving does not fade 2. COATING LENS: ND CPL filter lens adopt multi layer coating process to give the lens quality water proof, oil, dirty and scratch resistant, and the color of the lens is different under the sun and light 3. NON SLIP GEAR DESIGN: Knurled pattern is set up above and below frame, easy to install and remove. 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 4. CLEAR IMAGING: CPL filter polarizer can eliminate reflections, improve image clarity, increase color saturation such as sky, white clouds, etc. Eliminate reflections from glass or water 5. REDUCE LIGHT: ND filter ND reduces the amount of light, avoids overexposure, can also resist scattered light, improve the color saturation of the picture, make the picture more transparent and gorgeous, and reduce the shutter speed when shoot video by reducing the lens Specification: Item Type: ND CPL Filter Material: Aluminum alloy(frame) and optical glass Application: For Action 3, for Action 4, for Action 5 Pro. Package List: 1 x CPL Polarizing Filter 1 x ND16 Filter 1 x ND32 Filter 1 x ND64 Filter 1 x Storage Box 1 x Wiping Cloth