The F series repair droid was a model of maintenance droid. At least five units from these series worked for the Star Tours travel agency. Each F series was commonly identified by the first three characters of their name (the letter "F" followed by numbers), which were followed by three additional capitalized letters followed by a lowercase "x." They generally possessed a silver body with photoreceptors of varying colors (namely red, green, and blue) as well as a trim with a choice of the colors red, gold, and blue.