DECORA 40 inches Number 1 large Gold Number Foil Balloons Digit air Ballons Birthday Party Wedding Decor Air Baloons Event Party Supplies Pack of 2 Size: 40" Foil Digital Air-filled / Helium Balloon Balloon will float when filled with helium. Will not float when filled with air. Balloons ship FLAT and DEFLATED. Take them to your local party store to have them pumped with helium. Tabs on the balloons make it simple to hang your balloons if preferred. Because of the particularity balloon, we cannot open to check the balloons. The disqualification rate is 0.5%.If have any quality problems, please contact us and we will help you solve it.