Customize your phrases using our Balloonify Black Mylar Letter M Balloon. This M-shaped party balloon can be put together with other Balloonify numbers and letters easily. With a durable construction, this mylar balloon is moistureproof and can withstand humid conditions. This foil balloon stays in the same size and shape throughout the event as its self-sealing design avoids air leakage. Inflate this letter balloon with air using a hand pump for an easy decoration process. To make your balloon decoration special, this reusable balloon comes with a hanging loop to hang it anywhere. The classy black finish of this party balloon exudes a sophisticated look to your entire party hall. Measuring 16 inches when inflated, this custom balloon can be filled 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.