Upgrade your event using our Balloonify Black Mylar Letter M Balloon. Combine this M-shaped party balloon with our other Balloonify numbers and letters. For efficiency, this custom balloon is made from durable mylar, making it moistureproof. With a self-sealing design, this mylar balloon locks in air or helium, maintaining its shape. Conveniently place this graduation balloon on walls using the built-in hanging loop. This birthday balloon comes in a beautiful black finish, allowing you to decorate your place in a sassy way. Measuring 40 inches when inflated, this reusable letter balloon is inflatable using a pump. 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.