Make any event extra special with our Balloonify Black Mylar Letter K Balloon. This party balloon is shaped as the letter "K" and can be paired with other Balloonify letter and number balloons to add a personal touch to events. Constructed with mylar, this black balloon is durable and moistureproof to help stop humidity from reducing its float life. With superior material strength, this letter balloon does not burst easily, making them reusable multiple times. The self-sealing construction of this birthday balloon prevents air leakage, making them quick and convenient to inflate. To save the time and hassle of manually inflating it, this balloon decoration can be inflated with helium or air using a pump. With a built-in hanging loop feature of this metallic balloon, the event organizer can create impressive custom decorations. This metallic foil balloon adds a modern and elegant touch to your events with its black finish. Each mylar 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.