The following is from the 3B website:
The accuracy with which this model is produced makes it a great teaching tool. However, the size of the model is it's primary strength.
Students can easily differentiate the outer ear, ear canal, middle ear, and inner ear. The structure of the eardrum is also much more easily understood by students with no vision when it is oversized.
This model has made instruction of the ear much more meaningful for my students.
The price may be higher than other such models.
This product can be ordered directly from 3B scientific.