K&F Concept Variable ND Filters Compatible with Gopro- ND2-32, ND32-512 -Neutral Density Filter Optical Glass with 28-layer Coating for Gopro 13 12 11 10 9 Black. Compatible with Hero 13/12/11/10/9 Black: This variable ND filter kit from K&F Concept includes ND2-32 and ND32-512 filters, featuring multi-coated, instant push-fit, easy to install and remove, ideal for shooting skiing, surfing, horseback riding or rock climbing, mountain biking, water surfing and other sports in the first perspective view.