Make your little one happy on their birthday with our Balloonify Black Mylar Number 1 Balloon. Pair this number 1 balloon with our other Balloonify number and letter balloons to create phrases for your loved ones. This party balloon is moistureproof and made of premium mylar, ensuring a longer float life in humid conditions. The sturdy construction of this birthday balloon makes it reusable, lowering your carbon footprint. With a self-sealing design, this metallic balloon precludes air from leaking out. This mylar balloon with a black aluminum foil finish complements all types of fancy celebratory decor. Easily assemble this graduation balloon with a hand pump. This custom balloon's built-in hanging loops allows it to be hung on walls for a more skillful presentation. 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.