Mesmerize your guests using our Balloonify Silver Mylar Letter M Balloon. Designed as the letter M, this graduation balloon can be personalized with our other Balloonify letter and number balloons. With its moistureproof mylar material, this silver balloon will remain in good shape even in humid conditions. In order to keep the air from leaking out, this letter balloon features a self-sealing design. This durable birthday letter balloon can be reused at numerous events without losing its shape. This party balloon can be filled either with air or with helium for convenience. With its silver finish, this balloon blends seamlessly into any decor. Using a hanging loop, you can display this giant mylar balloon on walls. This birthday party balloon measures 16 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.