Today was the third time I took the blue plastic balls to juggling at CMU. They continue to hold up and there may actually be hope that this material will work. The denim and duck cloth start to become rounder when they are broken in. Also the seams on the cloth ball’s seams tend to flatten out as they are used. that is not happening with the plastic balls.
So if this material works there will need to be some work on the pattern. Even so we are at two weeks with a bunch of different people jugging them. So this is a good sign.