Easy-to-use, multi-sensory model uses a simple hand pump to demonstrate basic heart and pulmonary blood flow. Create a memorable exploration of how the heart and lungs work together for oxygen exchange. No mess - liquid is sealed in! Includes clearly labeled heart chambers, main artery, veins and lungs, plus activity guide. 12 in. L x 11 in. W x 5 in. D. WARNING: Choking Hazard. Small Parts. Not for children under 3 yrs.