AmeriGlo light sticks are used world wide by military, law enforcement, search & rescue teams, and well equipped individuals. Rated as an industrial grade light stick, the AmeriGlo brand is ideal for long term storage (up to 4 year shelf life), and use in all weather conditions (100% waterproof and it floats!). AmeriGlo light sticks are brighter, more versatile, and have longer illumination than common novelty grade glow sticks.