This is a promotional item provided to Kickstarter backers of The Feds (though separately available directly from Dr. Finn's Games). The pack has 12 special agent cards (3 per player) and 2 rules cards. Each player replaces 3 of their regular agents with the matching special agents. During the game, when your special agent is forced out of surveillance and revealed, you may perform a special ability as described on the card. —description from the publisher