Create a one-of-a-kind backdrop to celebrate occasions with our Balloonify Black Mylar Letter O Balloon. Use this party balloon shaped as an 'O' to enhance celebrations by pairing them with our other Balloonify letter and number balloons. The mylar construction of this letter balloon makes it durable against heat and moisture to ensure a longer float life. With durable construction, you'll be able to reuse this birthday balloon, ensuring sustainability. This easy-to-use metallic balloon comes with a self-sealing valve to stop accidental air leakage. Inflate this mylar balloon to its full capacity using a hand pump to make the process effortless. This graduation balloon with an aluminum black foil finish complements all kinds of decor. Use the inbuilt hanging loop of this custom balloon to hang it from walls and ceilings. 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.