Decorate your party with this building blocks happy birthday foil balloon and watch smiles light up all around. Just fill this foil balloon with either helium or air (a balloon pump will be required). This helium-quality balloon will also look great with assorted latex balloons, curling ribbon and a balloon weight as part of a festive balloon bouquet or table centerpiece. You can even tie it to a letter box or outside railing to show your guests where the party is. Get ready for a wonderful time with more of our party supplies.