Amazon.com : SOONSUN 6-Pack Lens Filter for GoPro Hero 7 6 5 Black (ND8, ND16, ND32, CPL, Light Red, Magenta Filter), Neutral Density Circular Polarizing and Dive Filters Kit for GoPro Hero
Amazon.com : Chronos Neutral Density ND Filter Set Includes ND 4, 8, 16, 32 with Cleaning Cloth for GoPro Hero 7 Black, 6, and 5 with 16-Layer Coated Lenses : Electronics