Demonstrate both sets of lungs simultaneously for better lung comparison. The interconnected airway system lets you compare the ventilation of both sets of lungs simultaneously, or simply shut off one of the upper valves to inflate only one set of lungs. Kit includes an interconnected airway system with dual trays, air pump, one pair of reusable, normal inflatable swine lungs with guide, one pair of simulated smokers lungs with guide, and one section of dried swine lung with a storage container. WARNING: Choking Hazard. Small Parts. Not for children under 3 yrs.