Tubies are fun to use and encourage hand/eye co-ordination and tracking. Watch the coloured balls disappear and reappear in the transparent tube and hear the sound as they travel through the Tubie. Tubies are ribbed and interesting to feel. If the hand is kept on the tube as the balls pass, a gentle vibration can be felt. This Floor Model Tubie stands independently on the floor or any other surface and the panel is 50 x 37cm. Six balls are included.