Extremely high quality ND filters made for the GoPro Hero 9, 10, 11, 11 Mini, 12 and Bones. They are extremely strong – made from 2mm thick Corning Gorilla glass and anodized aluminum, these are the strongest ND filters in the world. The glass is nanocoated to reduce glare, repel water, oil and to make fingerprints easy to wipe off. These filters twist on and off without tools, replacing the clear lens covering, maintaining the waterproof seal.