Enjoy hours of fun and learning with the 4M KidzLabs Tornado Maker Science Kit. Recycle an empty bottle to construct this battery-operated Tornado Maker. Amaze friends and family with this mighty power of this natural phenomenon. With a plastic bottle filled with water, create a terrific tornado on any tabletop. Assemble the set with cross-head screwdriver and power with 2 AA batteries, sold separately.