Amazon.com : PolarPro - Shutter Collection - Filters for GoPro Hero 9, 10, 11 & 12-3-Pack Filter Kit - ND8, ND16, ND32 - Neutral Density Filters - Ideal for Mid-Day or Bright Environments : Electronics
Free shipping + tracking number 4pcs Lens Filter Diving Filter Gopro HERO 3+ 4 Camera Housing Case Underwater Lens Converter - AliExpress
Nflightcam Propeller Filter For GoPro Hero3+ And Hero4 | Aircraft Spruce
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
Glass Stick-on ND filter for GoPro Session 4/5 – Camera Butter
FLIP7 One Filter Kit with DIVE Filter for GoPro 3, 3+, 4, 5, 6, 7
FX Filters | GoPro HERO9/10/11/12 Black | Innovative Gear for Content Creators
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
Flip Filters FLIP7 Pro Package with SHALLOW, DIVE & DEEP Filters & +15 – Reef Photo & Video