What will happen when a large balloon filled with air is connected to a smaller balloon filled with half as much air? Answer: the small balloon becomes smaller and the large balloon becomes larger. Is this always the case? No? hmm... There is much for everyone to learn from this apparatus. Includes: instructions, connecting tubing with valves, and balloons.Also available: Easy Balloon Inflation Kit - Blow up your balloons without wasting your breath! Includes: special one-way tubing assembly and LuerLOK Syringe.