NOTE: Adult supervision required as items may cause choking. Foil balloons are sensitive to extreme temperature changes. In cold air, they may appear deflated; warm air should expand them again. Foil can conduct electricity. Please do not release helium-filled foil balloons outdoors or use near overhead power lines. Use only non-metallic ribbon and attach the balloon to a weight to keep it from floating away. BUY NOW! Please contact us if there any question. We will handle it within 24 hours.