This is a filter set made by Freewell specifically for the DJI Action 2. The set includes ND8, ND16, ND32, and CPL filters. These can be used to create various photographic styles using light reduction and polarization. They attach magnetically with a satisfying click, making them convenient to use. This item is being sold because I no longer use it. It has been used infrequently, and some filters have never been used. There are only a few scratches on the surface of the case, and the filters themselves are in clean condition. The included items are all shown in the photos, including the English manual and cleaning cloth. Please refrain from negotiating the price, as I am unable to accommodate price reductions.