Each Innistrad: Crimson Vow Theme Booster contains 35 cards, 1 token or ad card, and 1 Helper card, with a combination of 1–2 Rare and/or Mythic Rare and 33–34 Uncommon and/or Common cards.
Theme Boosters let you pick the kind of cards you want to upgrade your favorite decks. Every card in a Theme Booster can go in a deck of that color or style, so you can be confident you're getting what you want.
There are six different Theme Boosters from which to choose: one each of the five standard mana colors, plus a "Vampires" themed booster.