... 21*24PrincipleNo heat, flame and sparks, no battery requiredAdvantageNon-toxic, non-flammable, non-radioactive, wat erproof, ... windproof Usageconcert, dance hall, Halloween, party, promotions, special events, festival, celebration, giveaway, carnivals,bars, nightclubs Non-toxic big colorful glow stick and no battery ...