Amazon.com : SOONSUN 4-Pack Lens Filter CPL ND8 ND16 ND32 Filter for GoPro Hero 5 6 7 Black, Neutral Density and Circular Polarizing Lens Filter Kit Lens Protector for GoPro Hero 5 6 7 Black Camera : Electronics
HERO6 BLACK ND FILTER 4-PACK
Amazon.com : TELESIN 3 Pack Neutral Density Filter ND8 ND16 ND32 Compatible with GoPro Hero 9 Black- Lens Filter Kit Lens Protector for Go Pro 9 Camera Accessories : Electronics
GoPro Slip On Neutral Density Filter ND2 ND4 ND8 CPL for Hero5 6 7 8 9 - SC-NDF - Stuntcams
Fotodiox GoTough Silicone Mount with Neutral Density 1.5 (ND32, 5-Stop – Fotodiox, Inc. USA
FLIP11 Two Filter Kit with DIVE & DEEP Filters for GoPro HERO 5, 6, 7, 8, 9, 10, 11
Glass ND filter for GoPro Session 4/5 – Camera Butter