 A bidding box is typically a plastic box with two slots, each containing a set of bidding cards.One slot contains 35 cards with symbols of bids (5 denominations—clubs (), diamonds (), hearts (), spades (), and notrump (NT)—in seven levels of bidding, numbered 1-7).The 35 bid cards are cut with tabs (as in a rolodex) and arranged in a staggered fashion so that any desired bid can be easily removed and placed on the table.