Amaze your guests with our Balloonify Black Mylar Number 3 Balloon. Designed as the number '3,' this custom balloon can be combined with our other Balloonify number and letter balloons to create unique messages. This party balloon is made of premium mylar, which makes it moistureproof and durable even in humid conditions. Made to last, this metallic balloon can be reused several times. When inflated, the self-sealing valve of this mylar balloon helps avoid air leakage. Using a hand pump, easily inflate this graduation balloon. This number balloon has a glossy black finish that augments all types and shades of decor. The hanging loops allows you to hang this birthday balloon from 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.