Let your guests be awestruck by using our Balloonify Silver Mylar Number 0 Balloon to decorate your event. Make personalized messages for birthday parties by combining this custom balloon shaped as 0 with our other Balloonify number and letter balloons. This party balloon is strong and won't pop in hot conditions, making it suitable for multiple events. Plus, the mylar construction makes this number balloon moistureproof. This birthday balloon's self-sealing valve aids in efficient inflating and deflating. Fill this metallic balloon with air using a hand pump to avoid inflating it the traditional way. This metallic silver mylar balloon adds to the appeal of your birthday party. The built-in hanging film allows you to hang this graduation balloon on walls. Measuring 40 inches in length, this foil balloon can be inflated with air or helium. To reuse these balloons, gently deflate, properly store, and carefully reinflate without overfilling. Shipped deflated in a 1 count box.