Deck up your party with our Balloonify Silver Mylar Letter I Balloon. Pair this birthday balloon shaped as the letter I with other Balloonify numbers and letters to create a personalized banner. This mylar balloon is moistureproof and can be used in humid conditions. Made from premium mylar, this party balloon is conveniently reusable for all your special occasions. Featuring a self-sealing valve, this balloon decoration avoids air leakage. This graduation balloon can be easily expanded using a hand pump. To choose between hanging or keeping the balloon afloat, this custom balloon can be inflated with air or helium. Incorporated with a hanging loop, this helium balloon lets you hang it on hinges. Featuring an electrifying silver finish, this giant balloon adds a dazzling touch to your parties. This mylar balloon measures 40 inches in length. To reuse these balloons, 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.