A ten chambered piston moves up and down to lift balls in this gadget. Watch Piston’s pleasing synchronous motion as all the balls move in unison from one stage to the next. It evokes an engine operating under a heavy load. This gadget is fully assembled and is powered by 2-AAA batteries and includes 15 marbles.

The fully assembled gadget measures approximately 4.0” x 2.0” x 4.5”