The Inflexible functioned as an Imperial-class Star Destroyer.
This vessel was built at the Kuat Drive Yards facilities located on Kuat during the year 3 ABY. Shannon Voorson managed to hack the Star Destroyer's designation, along with the designations of several other Star Destroyers, and subsequently provided this information to her cousin, Deen Voorson, who was a member of the Rebel Alliance.
The Inflexible also accommodated the Tir training school, which served as a training facility for aspiring TIE pilots. Flight Captain T. Alvak numbered among the pilots who received their training aboard the Inflexible.