Transform any party space into a captivating realm with our Balloonify Blue Mylar Number 4 Balloon. Shaped as the number '4', this custom balloon can be paired with our other Balloonify number and letter balloons to your liking. The mylar construction of this party balloon gives it moistureproof properties that allow it to stay afloat in humid conditions. This metallic balloon is reusable, as it has a durable build. Once inflated, the air valve on this mylar balloon seals itself to help deter leakage. You can easily inflate this graduation balloon to its full capacity with a hand pump. This number balloon has a blue foil finish that evokes a royal radiance in your party room. Use the built-in hanging loops on this birthday balloon to hang it directly from walls and ceilings. 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.