Description: Teaching Aid: This lung breathing model is specially designed for classroom experiments and teaching, which can help students understanding the human respiratory system.Easy to Understand: Simply pull onto the bottom rubber section to view of how the lungs work, apparatus that consists of two sacs, which represent the lungs, a rubber membrane.Classroom Teaching: The Lung demonstration model is rich details, clearly showing the structure and working principle of the human lungs.Educational Toy: Easy to operate, students can do the experiment by themselves, improving their practical skills and scientific literacy.Nice Gift: The teaching toy can be used as nice gift for biology enthusiasts, or as part of a science education display. Specification: Material: PP Size Chart: Height 11.5cm/4.53inchBottom 7.5cmx5.3cm/2.95inchx2.09inch Package Includes: 1 Lung Teaching Model Toy (The color is random)