The Dynarex Disposable Penlight (20 Bags/Box) (#4781) provide focused illumination during examination and treatment. Printed on the side of each Portable Penlight is a labeled pupil gauge, convenient for sizing pupils. This penlight is constructed from lightweight, high-impact molded styrene featuring a dual-function pocket clip, and is ideal for EMT's, physicians, and nurses. Given the disposable nature, this particular penlight is intended for one-time use.