ND Filters / Lens Filter for GoPro HERO4 /3+ /3 Sports Action Camera
Amazon.com : CamKix Cinematic Filter Pack Compatible with GoPro Hero 4 and 3+ Includes 4 Neutral Density Filters (ND2/ND4/ND8/ND16), a UV Filter and a Cleaning Cloth. : Electronics
Freewell Standard Day ND 4-Filter Set for GoPro HERO FW-H5B-ND
SANDMARC Aqua Dive Filter for GoPro Hero 7, 6 & 5 Super Suit - Red, Magenta & Yellow
PolarPro Red Filter for GoPro Hero3 / Hero3+ / Hero4 60m Dive Housing
Diving Lens Filter Kit for GoPro Hero 4 and 3+ - Waterproof Housing – CamKix
Gopro Hero 10 Black Accessories | Go Pro Accessories Red Filter - Gopro Hero 10 9 - Aliexpress
ND Filter Set for GoPro Hero 9, Hero 10, Hero 11, 11 mini & Hero Black Bones – Camera Butter