SnapLight is an industrial grade chemical light stick measuring 6″ long and providing instant 360 degree illumination. These light sticks can be seen up to a mile away for up to 12 hours in optimal conditions.SnapLight is waterproof, non-toxic, and non-flammable and has a hook for hanging or attaching. Each light stick is individually foil-wrapped for protection from light and moisture, and has a five-year shelf life from date of manufacture.SnapLight® Industrial Light Stick FeaturesUp to 12 hours of bright, reliable light thanks to patented formulationsFive-year shelf life from date of manufacture for a maintenance-free solutionMade in USA to ensure highest qualityMeasures 6″ long and provides 360 degrees of illuminationHook and hole at top for hanging or attachingChemiluminescent substance is non-toxic and plastic body is phthalate free for safety