Description smoke is the most common cause of lung cancer. This dramatic demonstration kit provides an impressive, unforgettable, hands-on demonstration of how lungs work and the effects of prolonged smoking. Features - Color: As shown. - Material: PVC. - Size: 20.00X18.00X14.00cm/7.86X7.07X5.50in - Made of high-quality PVC material, durable and practical for long-lasting use. - Fine craftsmanship and exquisite details, make it realistic and lifelike, excellent and educational. - Suitable for the teaching of physiology and in middle schools and the teaching of anatomy in medicine schools, nursing schools and health schools. - The smoker's lungs have a palpable internal tumor and a physical simulated external tumor to encourage students to feel the texture of the lungs, and to remember that smoking is a known cause of lung cancer. - Let you explain the knowledge in the books more concretely, which makes it easier for students to learn. Package list: 1 x model