The 4.5 cm diameter balls are safe, and easy to grip, even for small children and are full of colourful beads, to provide visual as well as auditory stimulation. There is so much activity, colour, and sound. Watch them roll, drop them from different heights, and explore all of the fascinating games. The tower is made up of 7 easy-to-assemble pieces, and the slow rolling of the balls captures the attention of the child, helping to develop hand-eye coordination and the concept of cause and effect. It’s all part of a fun and engaging game. Once assembled, the towers height is 40 cm. Suits ages 1 year +.