Cats are always interested in moving things. This Tower of Tracks Cat Toy would perfectly satisfy their needs. This tower consists of 4 layers. Three colorful balls run and spin around on the 3 tracks between each layer respectively. As balls are moving, cats could run around the tower to play with the balls. The base firmly sticks to the ground and stand sturdy so that cats could keep having fun without interruption. With Petstages Tower of Tracks Cat Toy, your kitty will train their body and mind simultaneously.