This is a educational construction kit assembled from various materials (plastic, metal, etc.).
Take a deep breath--and now say "Thank you" to your lungs! And now gaze upon this fascinating model kit, a 1/3-scale replica of the human respiratory system! Touted as a "new type of puzzle," this prepainted model kit, with 21 pieces, assembles into a detailed cutaway model of the lungs and esophagus (with a heart tucked snugly inside, too), showing all the fascinating workings within. An assembly guide is included, as is a stand for the respiratory system and for the bonus model of an alveoli! It'll leave you breathless!
Please note a prototype is shown; the production version may vary.