It comes with 3 x balls, one of which rattles, providing auditory stimulation, whist the other 2 two-tone ball provide visual stimulation. The tower is made up of 7 easy-to-assemble pieces including the base and will measures 46 cm high, once fully assembled. Watch the balls roll down the tower or drop them from different heights to capture the attention of the child, helping to develop their fine motor skills, sensory development, hand-eye co-ordination and well as helping them learn case and effect. Suits ages 1 year +.