When playing roulette, it’s important to pay attention to the “frets”.
The frets are the tiny walls that separate the pockets.
Normally, these are “springy” and allow the ball a higher bounce into a further pocket.
But, if they are loose, the ball will bounce less and land in certain pockets more frequently.
If one can identify these, there is a greater chance of winning!
Also, when the wheel isn’t “seated” properly, the ball will land in a certain section more often.
By the way, the ball itself is made of ivory or plastic.