Material: PVC Specifications: Enlarge The size is about: 21 33 23cm 8.3 13 9.1inIt shows in detail dozens of digital marks in the anatomical structures of the outer ear, the middle ear and the inner ear of the human body. It also shows the structures of the atrium, the external auditory channel, the tympanic cavity, the tympanic membrane and hearing bone, the eustache, the oil part of the temporal bone and the labyrinth of the labyrinth of the'inner ear. It is composed of five parts: the outer ear, the middle ear, the oil part of the temporal bone and the labyrinth of the inner ear. The external auditory channel of the temporal bone can be moved, the labyrinth can be picked up and open, and the tympanic membrane, malleus and incus can be separated. The size is about: 21 33 23cm 8.3 13 9.1in.