OK, there is some confusion here with the balls.
There are 2 different types of 13" balls on the Palos Sports site,
here (13" ball 1) and
here (13" ball 2) .
We gotta buy the right ball. The texture, wall thickness, material elasticity, and friction coefficient needs to be right.
I don't have the ball in front of me. Does anyone have one so that they can post the model number on the ball?
Thanks,
Andy B.