The size is about: 21 33 23 cm 8.3 13 9.1 inches. The outer auditory channel of the Petroo part of the temporal bone can be moved, the maze can be collected and open and the tympanic membrane, the Malleo and the anvil can be separated. It consists of five parts: the outer ear, the middle ear, the petroo part of the temporal bone and the maze of the inner ear. Also shows the earphone facilities, external auditory channel, tympanic cavity, tympanic membrane and hearing oxycens, Eustachio tuba, petroo part of the temporal bone and maze of the inner ear. Show in detail dozens of digital signs in anatomical structures of external ear, middle ear and inner ear ear.Show in detail dozens of digital signs in anatomical structures of external ear, middle ear and inner ear ear. Also shows the earphone facilities, external auditory channel, tympanic cavity, tympanic membrane and hearing oxycens, Eustachio tuba, petroo part of the temporal bone and maze of the inner ear. It consists of five parts: the outer ear, the middle ear, the petroo part of the temporal bone and the maze of the inner ear. The outer auditory channel of the Petroo part of the temporal bone can be moved, the maze can be collected and open and the tympanic membrane, the Malleo and the anvil can be separated. The size is about: 21 33 23 cm 8.3 13 9.1 inches.