Don't make it too big, otherwise it will not bounce much, and also don't make it too small, it moves a lot faster, bounces higher and it is easier for them to glitch out the track. First, use the circle tool to make a circle.
The first thing people needed to do to make a marble is to make a circle that rolls like a marble and bounce like a marble (Except if they are using custom marbles.). The tracer is not nessacery, but a lot of people use them. Marbles are made out of two different parts-circle and tracer.
Marbles are the most important things in any marble races.
