Star Wars X-Wing (2nd Ed): Tantive IV Expansion Pack - Rules of Play says:

Within this expansion, you’ll find everything you need to add one CR90 Corellian Corvette ship to your Rebel Alliance or Galactic Republic squadron, including ship cards, tokens and maneuver dials. Finally, this expansion also includes the components you need to fly this or any other huge ship in battle, including a huge ship maneuver tool and a huge ship damage deck.