Refill SnapLight light sticks for use with the Cyalume LightStation Model 4, Light sticks measure 10" long and provide up to four hours of 360-degree illumination, Chemiluminescent substance is non-toxic and plastic body is phthalate free for safety. Five-year shelf life from date of manufacture for a maintenance-free alternative to other lighting Please Note: The expirations dates are very conservative, due to the military requirements, but these light sticks are good for many many years after the expiration date. Features Color: Yellow Duration: 4 Hour Expiration Date: 01/2015 To Activate: Remove from foil, Bend, Snap and Shake. MADE IN USA