Son'a drones
A Ba'ku hit with an isolinear tag by a drone
Son'a drones were small automated flying devices used by the Son'a, capable of shooting isolinear tags. These probes were capable of pursuing moving humanoids, targeting them and firing dart-like tags onto them.
In 2375, two Son'a shuttles launched several dozen drones on the Ba'ku planet when their transporters were unable to lock on to the escaping Ba'ku and Starfleet personnel. At least fourteen drones were destroyed in the pursuit. (Star Trek: Insurrection)
The Son'a drones were designed by Edwin Natividad, inspired by set drawings by Sharon Davis. John Eaves did some concept art revisions dated May 1998. Three aluminum physical models for Data to destroy were constructed by property master Bill MacSems. (The Secrets of Star Trek: Insurrection, pp. 160-161)
Star Trek: The Magazine featured a technical briefing on the Son'a drones with component callouts in Star Trek: The Magazine Volume 1, Issue 1, p. 81.