Celebrate that special someone?s birthday with this elegant watercolor Happy Birthday Balloon. Combine a couple of these balloon designs with a few of our 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. Arrives uninflated and can be inflated with helium to float or with a balloon air inflator. Measures 18inches on inflating. Multicolor.