Model Size 4-3/4” x 4” x 3-1/2” Card Size 6-1/2” x 5-1/4” Base Size 6-1/2” x 5” This oversized child’s ear illustrates: semi-circular canals and cochlea of the inner ear; auditory ossicles, otitis media (inflammation and simulated fluid in the middle ear); tympanic membrane, temporal and tensory tympani muscles; the model also presents a horizontal eustachian tube typical of a child.