What does the glass ball mean in dune?

I think it means that your ball is like glass and can fail easier than on the normal reach the end? I could be wrong but this is my guess

It means your momentum is more fragile for certain challenges

I believe it means that the actual glass ball that you can choose in the ball selection area is the best one to use. It’s the 15th ball over from the beginning. I don’t know 100% if this is correct, but it’s the only answer that makes sense to me given that there is in fact a ball that looks “glassy”. There are no titles for the balls so....who really knows?

I believe the glass ball means the ball is heavier. If you notice how light and how high a normal ball can go, a glass ball is much heavier and it won't go as fast.