Sky Glass VND Filter: A Variable ND Replacing Filters ND 8 - 32 Crafted with precision from CNC aluminum and subjected to meticulous double iodization for exceptional durability. Featuring premium glass with a rotating adjustable ND mechanism, our filter offers unparalleled control over light exposure. Seamlessly transition between 2 to 5 stops of light blocking power, equivalent to ND 8 through ND 32, ensuring your footage is consistently perfectly exposed. A Few Important Notes: Not Waterproof: To avoid potential damage, refrain from using the filter around water. Compatible with: Hero 9 Hero 10 Hero 11 Mini 11 Hero 12 Hero 13