Make your special event into a memorable one with our Balloonify Blue Mylar Number 4 Balloon. Made into the shape of a 4, this party balloon can be paired with other Balloonify number and letter balloons. With a durable mylar material, this foil number balloon effortlessly withstands moisture. Plus, this number balloon is conveniently reusable and maintains a premium appearance. The self-sealing design in this birthday number balloon is easy to inflate and deflate. For your convenience, this giant number balloon can be inflated with a hand pump using air or helium. To suit shark or marine-themed parties, this helium number balloon has an aluminum blue foil finish. The hanging loop in this giant number balloon allows you to hang it on walls or ceilings to make your display the highlight of your celebration. This foil balloon measures 16 inches in length. To reuse these balloons, gently deflate, properly store, and carefully reinflate without overfilling. Shipped deflated in a 1 count box. This party balloon can be easily inflated with the included straw, providing you with full control to help eliminate the risk of over-inflation. Electric air balloon pump (SKU: RWP1061) sold separately.