(a) A ball used in Roulette must be made completely of a nonmetallic substance and not less than 12/16 inch nor more than 14/16 inch in diameter. § 617a.1. Roulette ball Roulette wheel and table physical characteristics double zero Roulette wheel used as a single zero Roulette wheel. Code § 617a.1. Roulette ball Roulette wheel and table physical characteristics double zero Roulette wheel used as a single zero Roulette wheel.