Foil Balloons are sensitive to extreme temperature changes. In cold air, they may appear deflated; warm air should expand them again. Extreme heat could cause the helium or air to expand and burst the balloon. Inflated with air this balloons stay inflated for months.Foil balloons may conduct electrity. Do not release filled foil balloons out doors or use near overhead power lines. If you are filling it with air, than you must pay attention to the folds on the baloon becouse they must remain. Not suitable for children under 36 months due to potential small parts which may pose a choking hazard. Adult supervision required. You are adviced to keep this information for future reference.