Most casinos use dice that are 6-sided. The standard size for casino craps dice is ⅝” (sixteenths of an inch) on each side.
They are usually made out of plastic or metal and weigh between 28 and 40 grams. The corners of the dice are rounded to prevent them from bouncing off the table and to ensure that they roll randomly.
There are a few casinos that use 8-sided dice, but this is quite rare. The 8-sided dice are usually used in private games or in games where the players have agreed to use them.
These dice are not as common because they are more difficult to control and they tend to roll less randomly than 6-sided dice.
The size of the dice you use does not affect the game, but it is important to make sure that all of the dice are the same size. This will ensure that the game is fair and that all of the players have an equal chance of winning.