Spellbind your visitors using our Balloonify Silver Mylar Number 1 Balloon. Fashioned as the number "1," use this balloon decoration with other Balloonify numbers and letters. The durable construction of this mylar balloon makes it moistureproof to increase its float life. With a self-sealing valve, the nozzle of this foil balloon instantly closes once the balloon is inflated to make it airtight. Conveniently hang this graduation balloon on walls or ceilings to beautify your walls. The metallic silver finish of this party balloon enhances the look of your entire event. Inflate this custom balloon with air or helium. This balloon decoration can be filled using a hand pump. Measuring 40 inches when inflated, this number balloon can be stored and reused conveniently. 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.