The number on an ND filter says how much light it cuts: ND8 is enough for an overcast day, ND256 is what you need in bright sun over water or snow. Sets usually hold three to six filters, some with a polarising layer (ND/PL) that reduces glare. Freewell, Sunnylife and DJI sets are made for a specific body — Mavic 3, Mini 3 Pro, Avata or Flip — so a filter from another model simply will not stay in place.
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The number on an ND filter says how much light it cuts: ND8 is enough for an overcast day, ND256 is what you need in bright sun over water or snow. Sets usually hold three to six filters, some with a polarising layer (ND/PL) that reduces glare. Freewell, Sunnylife and DJI sets are made for a specific body — Mavic 3, Mini 3 Pro, Avata or Flip — so a filter from another model simply will not stay in place.