ElectromagnetCanonLegendsInfinities Sources Star Wars Helmet Collection 16Star Wars Helmet Collection 16Star Wars Helmet Collection 35Star Wars Encyclopedia of Starfighters and Other VehiclesStar Wars: The Complete Visual Dictionary, New EditionAppearancesDoctor Aphra: An Audiobook Original (Unknown)Unknown UnknownNoneStar Wars: Episode VI Return of the Jedi (First appearance) (Unknown)Unknown UnknownNoneStar Wars: Return of the Jedi junior novelization (First identified as electromagnets) (Unknown)Unknown UnknownNone