The European roulette wheel is comprised of 37 pockets, numbered from 0 to 36, whereas, the American roulette wheel has 38 pockets, with the additional pocket being labelled as double zero (00). The additional pocket on the American roulette wheel can make all the difference when it comes to winning odds.

A French roulette table has 37 numbers from 0 to 36 in 3 columns of 12 boxes each. All boxes are marked with a number from 1 to 36, with 18 red boxes and 18 black boxes. When the croupier spins the wheel, a ball falls and lands in one of the numbered pockets, which becomes the winning number.