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
SOONSUN CPL ND8 ND16 ND32 Filter for GoPro Hero 12 11 10 9 Black Red Color Filters Kit Go Pro Polarized Camera Lens Accessories - AliExpress
ND Filters | GoPro HERO5/6/7 Black | Innovative Gear for Content Creators
Telesin ND Filters For GoPro Hero Black 5,6,7 | eBay
Gopro Hero 9 /10 / 11 / 12 Action Camera Filter 6PCS Set (CPL,ND8,ND16,ND32,ND64,ND1000) with 3PCS Vacuum Cleaning Cloth, HD Lens, Anti-reflection Green Film, Waterproof and Scratch-Resistant - KENTFAITH
Telesin ND Filters For GoPro Hero Black 5,6,7 | eBay