Universal Naked GoPro ND Filter/Lens protector adapter – Camera Butter
Amazon.com : TELESIN 3 Pack Neutral Density Filter ND8 ND16 ND32 Compatible with GoPro Hero 11 Hero 10 Hero 9 Black- Lens Filter Kit Lens Protector for Go Pro 11 10 9 Camera Accessories : Electronics
Action Camera Filter Set 4pcs HD (ND8/PL+ND16/PL+ND32/PL+ND64/PL) withAnti-reflection Green Film for GOPRO Hero 9/10/11 - KENTFAITH
Glass ND filter for GoPro Hero 5/6/7 – Camera Butter
SOINSUN 3 Pack Dive Filter for GoPro Hero 8 Protective Housing - Red,Light Red and Magenta Filter - Enhances Colors for Various Underwater Video and Photography Conditions - SOONSUN