I've used Thera-Band balls at the place where I got physical therapy and I know they are great quality. The issue I had was that the ball I received did not come with an adapter that would allow me to inflate it with a bicycle pump, nor did it come with a plug. So basically it was unusable, as you can't inflate it without a plug to stop the air from exiting once it's inflated. Also, if you don't get an adapter for a bicycle pump, you will need some sort of pump that can fit into the hole of this ball to inflate it.