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