The PolarPro Slim Frame Neutral Density (ND) Glass Filter is a snap-on accessory designed specifically for the GoPro HERO3 camera's waterproof or skeleton housing. This filter reduces the amount of light entering the lens by 3 stops, effectively slowing down the camera's shutter speed. This adjustment results in smoother motion blur, which is particularly beneficial in high-speed activities such as motorsports, aviation, or drone filming. The filter is constructed from scratch-resistant glass to maintain image clarity and is designed for quick installation and removal.