Amazon.com : DJI Osmo Pocket - Set of 4 ND Filters (ND4, ND8, ND16, ND32) for Camera Lens, HD Photos, Light-reducing Materials, Magnetic Design, Easy to Change, Compatible with DJI Osmo Pocket,
Osmo Pocket ND Filters from Freewell - YouTube
PGYTECH ND/PL 4-Filter Set for DJI Osmo Pocket/Pocket 2
Shooting with PolarPro's six-pack ND filter set for the DJI Osmo Pocket: Digital Photography Review