You know the type of dog that can't help but try to pull every piece of stuffing out of their plush toys? This is the toy for them! Filled with 10 balls inside the pocket. About half of the balls have a squeaker, which is just enough to drive them nuts because they just keep searching for the right one! If you lose some of the balls or need to replace them we have a package with 12 replacement balls Balls are approximately 2 ½” diameter