Foil balloon number 1 (85cm)
The package contains one empty helium-filled foil balloon in the form of a number.
The height of the balloon is about 85 cm.
Properly filled and sealed foil balloon stays in the air for several weeks.
Foil balloons are sensitive to temperature changes (in the cold it shrinks, and in the warm it swells). Very hot air makes the helium swell, and the ball can burst.
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