 In the other slot are a supply of Pass cards (usually 6-10 cards, commonly colored green), a few Double (red, usually marked X) and Redouble (blue, XX) cards, an Alert card (light or dark blue), a Stop card (red), and, optionally, a Tournament Director card (orange).There is one bidding box for each of the four players, usually placed at the corner of the table to the player's right; in duplicate tournaments, boxes remain stationary on the tables.