The Tiffen 3-Filter ND Kit for GoPro HERO9 Black includes ND8, ND16, and ND32 filters designed with 4K high-definition optical glass and waterproof and anti-scratch multi-coating. The filters reduce the amount of light hitting the camera sensor by 3, 4, and 5 stops, respectively, allowing you to capture accurate images in bright outdoor environments. With a filter attached, you can set the proper shutter speed in the camera and prevent washed-out images.