Make your celebration even more special with our Balloonify Silver Mylar Number 4 Balloon. Shaped into a number 4, this foil number balloon can be paired with other Balloonify number and letter balloons. Made from mylar, this foil number balloon is moistureproof to perfectly stay afloat during wet conditions. With a durable material, this giant number balloon is also reusable. To inflate with ease, this party balloon has a self-sealing design and can be inflated using a hand pump. For your convenience, you can inflate this number balloon using air or helium. With an aluminum silver foil finish, this mylar number balloon will enhance all kinds of decor. Plus, you can use the hanging loop in the birthday number balloon to hang it on the wall or ceiling. This helium number 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.