Personally I crack systematically for LUDI balls. Beyond the ball function, they still have more to offer us qqchose and are highly resistant in terms of inflation and colors.
Here it is the contents of small balls (that will not go out) multicolor that make noise when shaken and rolls the ball.
The age range is very wide but it takes imagination of parents for children. Indeed, for those there the ball will serve as auditory alert, visual and touch.
The ball is very soft and pleasant to the touch, easy to grasp with small hands, light and apart from a slight sound of the balls, it is a silent toy that will not disturb the neighbors.
My kids love and play with for hours.
I advise.