Unlike the rigid oral airways, these devices are soft. They have a bevelled tip to reduce the risk of trauma to the nasal passage during insertion. Still, the possibility of causing trauma inside the nasal cavity and nosebleeds is a definite disadvantage of these devices.
These devices are used to help with creating and mainaining a patent upper airway, often in conjunction with the basic airway maneuvers.
Sizing and insertion are described in the 'basic airway maneuvers' article.