The slightly narrower cards are more suitable for games such as bridge and some types of poker, where a number of cards must be held or concealed in a player's hand. In most U.S. casino poker games, plastic bridge (narrow) sized cards are used; this is for both ease of use and dealing, and the plastic cards last much longer than paper decks. U.S. casino shuffling machines have traditionally been designed for bridge-size (narrow) cards for these reasons. In other table games, such as 21 (blackjack), a modern casino may use hundreds or even thousands of decks per day, so paper cards are used for those, for economic reasons. Poker-size (wide) paper decks are used for 21 and other similar games. Other sizes are also available, such as a smaller 'patience' size (usually ) and larger 'jumbo' ones for card tricks.