Exercise is very important to your pet in order to keep him fit
and healthy. The Playground Sport Wheel is designed to work with either a wire
cage or a smooth surface such as an aquarium). The wheel is mounted on the side
of the cage and your pet can move easily in and out whenever they feel the need
to exercise. The Sport Wheel is amazingly quiet and even has an opening in the
middle so that any solid waste will be ejected from the wheel.