The Middle Ear Infections chart is a detailed overview of the causes, symptoms, and treatments for otitis media, or infection of the middle ear. Acute otitis media, otitis media with effusion and Eustachian tube dysfunctions are explained through graphics and type. Heavy gauge 3ml lamination with sealed edges and two metal eyelets for hanging makes chart highly durable. Write-on/wipe-off with dry erase marker (not included).