1、Reduce the amount of light entering the camera, extend the exposure time, and effectively reduce the shutter speed. 2、The number behind ND represents the ability of the ND lens to block light, the larger the number, the strong the light reduction ability. 3、Made of high‑definition clear colorless optical glass, which helps to improve photo clarity and color reproduction, fit for Osmo Action camera. 4、Protect the lens from dust and scratches, in normal use, it can be shaken, or jumped at will without worrying about falling off. 5、Strong magnetic adsorption design, can be firmly adsorbed by lightly approaching, perfectly fits the lens, well coordinated, easy to disassemble. 1 x ND Filter1 x Manual Item Type: ND FilterMaterial: Optical Glass+AlloyColor: BlackWeight: Approx. 27.0g/ 1.0ozFit for Osmo Action cameraEffect: Reduce the amount of light entering and extend the exposure time