Endure Oropharyngeal Airways are made of polyethylene and are semirigid. There are 8 different sizes with color-coded bite blocks, for easy size identification. Endure Oropharyngeal Airways function as an airway, a bite block, and a tongue depressor. The center passage allows the transmission of suction catheters to clear secretions from the back of the throat. Each airway is individually wrapped, non-sterile, and latex free.