Vampire: The Masquerade - Rivals Library Deck Sleeves 55ct: - Rules of Play says:

When the sun sets, the undead awaken. To slake their Hunger, they feed upon the herdof unaware mortals. Right beneath our noses, the Kindred clash against their rivals asthey vie for control of the city of San Francisco and the coveted title of Prince. Vampire: The Masquerade–Rivals is an expandable card game for 2-4 players basedon the popular roleplaying game set in the World of Darkness.These sleeves aredesigned to cover the Library Deck and City Decks respectively.