The Osmo Pocket ND Filter Set from DJI features four neutral density filters that attach magnetically to the gimbal lens. ND filters reduce the amount of light entering the lens in order to help you get a more proper image in various outdoor conditions, and the magnetic factor allows the convenience of quickly swapping one for the other to try different options. The set includes ND4, ND8, ND16, and ND32 filters, which cut light by 2, 3, 4, and 5 stops, respectively, giving you more control over aperture and exposure time. You can use them interchangeably, as needed, in cloudy and overcast, slightly cloudy, bright, and extremely bright conditions to improve your image.