Feature: 1. CPL Polarizer: Generally used for landscape photography, it eliminates unnecessary polarized light, making the whole picture clearer and more transparent. 2. Multi Layer Nanometre Coating Process: The lens is waterproof, oil proof, anti fouling, and scratch resistant, protecting the lens from dust and scratches. 3. Applicable Models: Magnetic installation, firm fit. Lightly approach, it can be firmly attached. And this CPL polarizing filter is specially designed for ACTION 2 cameras. 4. Aviation Aluminum Alloy Frame: CNC accuracy machining, ingenious design of frame, no need to worry that the filter will scratch or damage the original lens. 5. Reserved Holes: Reserve the holes for the radio and indicator light, which will not affect the radio and indicator light display. Align the two small holes on the filter with the indicator light and the sound pickup hole of the main camera, and gently close to it and absorb it instantly. Specification: Item Type: Camera Lens Filter Weight: Approx.40g/1.4oz Material: Aluminum Alloy, Optical Glass Product Size: 40x40mm / 1.6x1.6in Applicable Models: for ACTION 2. Package List: 1 x Filter1 x Wipe1 x Storage Box