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
Team BlackSheep Online Store - ETHIX Tempered ND8 Filter for Gopro 7 & 6
PolarPro GoPro Hero8 Filters - Neutral Density ND8/16/32