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Celebrate that special someone’s birthday with this fun 18″ round Birthday Rainbow foil mylar balloon! Combine a couple of these 18″ Betallic balloon designs with a few of our birthday latex balloons to create a bouquet cluster to give someone as a special gift or to use as birthday party decor. This balloon includes a self-sealing valve, preventing the gas from escaping after it’s inflated. The balloon can be inflated with helium to float or with a balloon air inflator. Balloon arrives uninflated. 18″ Birthday Rainbow Balloon by Betallic