Material: PVC Description: The model shows the small branches of principal bronchus:1. Section of bronchiole of no cartilage.2. The relation between pulmonary alveoli and terminal bronchiole.3. The structure of alveolar sac and alveolar duct.4. The capillary rete in the alveolar sapta.Made of PVC plastic and mounted on plastic base. Size: 26x15x35CM.