Effortlessly set up the most memorable event with our Balloonify Black Mylar Number 0 Balloon. This party balloon, shaped as the number 0, can be combined with our other Balloonify number and letter balloons to create custom banners. Made of mylar, this number balloon is moistureproof, allowing it to float even in humid conditions. This birthday balloon is reusable for all of your upcoming celebrations with its sturdy construction. The self-sealing valve of this metallic balloon inhibits air leakage and keeps the balloon in pristine condition. Rather than blowing it yourself, this mylar balloon can be inflated with a simple hand pump. This graduation balloon is designed with a metallic black shade to complement your party setting. You can hang this custom balloon with other balloons with its built-in hanging valve. 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.