It is a anti-scratch, drop-proof, UV-resistant filter that provides effective protection for camera lenses. By helping to reduce scattered light and resist light damage, this filter enables HD-compatible picture quality and clear night shots. This filter is made of high-quality aluminum and optical glass material. The length is 3.2cm, the width is 3.2cm and the thickness is 1.2cm. This camera filter is compatible for GOPRO HERO9/10/11. Item Name: Camera Filter Material: Aluminum, Optical Glass Features: Anti-corrosion, Anti-light Damage, Scattered Light Reduction A: CPL, Polarization Lens (helps reduce harsh light) B/C/D/E/F: ND Filter (limit the amount of light that enters the lens of a camera) B: ND4, reduce light by 1/4 C: ND8, reduce light by 1/8 D: ND16, reduce light by 1/16 E: ND32, reduce light by 1/32 F: ND64, reduce light by 1/64 G: Resistance to light damage, eliminate yellow light at night H: STAR: take snowflakes effect, or photograph light at night Size Details: L: 3.2cm/1.26", W: 3.2cm/1.26", H: 1.2cm/0.47"(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Camera Filter