Triangle warning flag is made of durable polyethylene which is water proof and UV resisitant,resists strong winds,rains, snow,sunlight exposure, it can be longtime used outside by attaching to the nylon string using double-stitched threading. Bight fluoresent colors makes it highly visible in any enviroment. You can also us it as grand opening banner, advertising flags,marking flags for lawn, parties, carnivals,special events etc..