107 cm. www.qualatex.com. Qualtex Suprafoil. 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 to expand and burst the balloon. Inflated with helium, this balloon will float for weeks and can be refilled. Foil balloons may conduct electricity. 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. Inks used on this balloon conform to US government standards. CE listed. Printed, manufactured, and packaged in the USA.