You mean ones you fill w/ water & put in the dryer to de-wri
I have one I got from my mom & wonder what she really saw in it?
She managed to bear w/ the thumpity-thump-to-loud banging and her dryer drum hasn't suffered a single mar or dent from it! Then again she'd told me to use a damp towel to get rid of wrinkles, which she'd mostly done, after the ball got used for its brief "trial period"...
I'm surprised that it's made from such a hard plastic instead of a softer rubber... My daughter was prone to playing w/ it & throwing it down on the floor trying to get it to bounce only to have long lost interest & leaving it on the shelf...
-- Dave