Enchant the overall atmosphere of your party with our Balloonify Black Mylar Number 5 Balloon. Featuring the number 5 design, this birthday balloon can be paired up with other Balloonify numbers and letters to create custom messages. Made from mylar, this number balloon is moistureproof to conveniently use even in sweltering conditions. This durable birthday balloon can be reused numerous times for different events. With a self-sealing valve, this party balloon ensures maximum float life, avoiding air leakage. Easily inflate this balloon decoration using a hand pump to save time. This mylar balloon is suitable for both air or helium inflation. Embellished with a black finish, this graduation balloon oozes a sophisticated look to your banquets. Incorporated with a built-in hanging loops; this custom balloon can be easily hung on hooks or nails. This black mylar balloon measures 40 inches in length. 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.