FLIP7 One Filter Kit with DIVE Filter for GoPro 3, 3+, 4, 5, 6, 7
Amazon.com : Underwater Camera Dive Filters for GoPro Hero 5, 6 and 7 Black Super Suit Waterproof Housing Case in Red, Light Red, and Magenta, Professional Color Correcting Photography Accessory : Electronics
NEEWER 6 Pack ND Filter Set For GoPro Hero 11/10/9 – neewer.com