Elevate your next event space with our Balloonify Silver Mylar Letter O Balloon. Styled in the shape of the letter 'O', pair this party balloon with other Balloonify letter and number balloons to create congratulatory messages. Highly durable, this mylar balloon withstands heat and is moistureproof, making it perfect for outdoor use. Plus, this letter balloon is reusable, as it has a long life. With a self-sealing valve, this birthday balloon retains its shape throughout the event once it is inflated. Inflate this metallic balloon using a hand pump to cut the hassle of blowing this metallic balloon yourself. This custom balloon has an aluminum silver foil shade to complement your silver-themed engagement party. The built-in hanging loop lets you hang this graduation balloon on walls. Measuring 16 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. 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.