four numeric bingo card per page - a tree friendly and economical size for big events.two numeric bingo card per page - a medium size.one numeric bingo card per page - useful if you wish to pre-print letterhead with your own instructions at the top portion of the page.These are all designed for Letter sized paper however, we have plenty of users from all over world, and many of them would use metric A4 paper. There are 3 sizes of cards, 1 per page, 2 per page, and 4 per page. These are North American format bingo cards with a 5x5 grid with numbers from 1 to 75 and the letters B, I, N, G, and O at the header and a free center square. The kind that you would find in home games, casinos, and on cruise ships. These are the standard style of bingo cards. Standard Numbered Bingo Cards Traditional Bingo cards, just the way you remember them