Why are there two different sizes of roulette balls?

There are two different sizes of roulette balls to accommodate the varying designs and sizes of roulette wheels used in different casinos. Typically, the smaller ball (around 1.5 grams) is used for European-style wheels, while the larger ball (about 2.5 grams) is often used for American-style wheels. The size affects how the ball interacts with the wheel, influencing factors like bounce and spin. Ultimately, the choice of ball size helps enhance the gaming experience and maintain consistency in play.