Part of backgammon basic equipment. A cube, which is a bit larger than the regular pair of dice, and has the numbers 2, 4, 8, 16, 32 and 64 marked on its sides. The cube indicates the number to multiply in order to get the current stake value. At the beginning of the game the cube is placed in the middle with the number 64 facing up (represents, no increase of the initial stake); either player may offer a double. If the double is accepted, the cube is turned to the next higher number and is transferred to the ownership of the opponent; if the opponent refuses to double, the game ends with him/her losing the current stake. Also known as: Doubling Block, Cube, Doubler.