Create beautiful balloon displays with our Balloonify Pink Mylar Number 4 Balloon. Crafted into the shape of the number '4,' this custom balloon is pairable with our other Balloonify number and letter balloons. This moistureproof party balloon is made of mylar, which increases its float life in both indoor and outdoor environments. The reusable design of this metallic balloon makes it highly sustainable. This graduation balloon has a self-sealing valve that makes it simple to inflate and deflate. Inflating this mylar balloon with a hand pump is as simple as it gets. Use this number balloon with a pink finish to add a chic touch to your party. This birthday balloon has a built-in hanging loops that allows it to be hung from walls as well as other surfaces. Measuring 40 inches in length, this foil balloon can be inflated with air or helium. To reuse this balloon, 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) is available and sold separately.