The ROAMA is a solid one-piece device for assisting the rescuer in choosing the correct size Oral Pharyngeal Airway (OPA) the first time.
No guessing, just measure from the corner of the ear to the corner of the jaw, then select the size indicated by the colour confirm the size and insert.
The colouring is to the International Standards Organization standards.
Solidly built, it is cleanable and reusable.