... Fantasy, X-Wing Miniatures, and many other Fantasy Flight games) and will fit in card sleeves of that size. I also like to put an actual card in between the front and back to give them a little heft, but YMMV.
The Invader printout is designed to be an easy to read list of invader capabilities to use at the table. It comes with the option of printing with or without flavor text or multiples of the same Invader (in case you want to be able to take notes on each individual Invader).