Take stacking to a whole new level with this fantastic air stacker! Place the ball in the base, insert a clear tube and turn on the fan, then stack other tubes and see the ball flying to the top! A fan-powered rocket stacker that blasts the ball up and down the rocket so your little rocket scientist can learn all about gravity and aerodynamics. With 7 numbered tubes, you can practice counting as you watch the ball float. Take building to a whole new level with the rocket stacker as you?ll see the ball flying through the tubes all the way to the top. This stacker certainly answers to their needs for building tall towers along with the fun animals, shapes, and numbers to boost cognitive development. FEATURES Learn about gravity and aerodynamics Practice counting as ball float Fun animal, shapes and numbers to boost cognitive development DIMENSIONS 18. 0x18. 0x90. 0cm Weight-1. 20kg