Kinds of PU ball,PU stress ball,mini round anti stress ball,PU foam ball,kids stress ball, ... anti stress ball / custom free stress ball / kids stress balls / mini round anti stress ball (polyurethane) 1)Material:Polyurethane foam2)safe ... material without toxic and safe for children 3)Solid with hands feel,squeezable4)Glossy surface,bright colors 5)different styles,shapes ...