The petros portion of the temporal bone section of the auditory canal are removable, with labyrinth which can be taken out and opened.
This is approximately four times full size.
The tympanic membrane with malleus and incus can be removed in 5 removable parts.

Biology School Lab Equipment Suppliers in India 

Ltekonline are the manufacturers of Ear Model Human Biology Equipment Lab used to demonstrate engineering principles in Engineering Colleges, Engineering Schools and Biology Laboratory Equipment for Engineering Teaching Lab in Universities