Kimetsu no Yaiba (Demon Slayer) 6-Piece Balloon Set 2 Round Balloons: 18 inches 2 Star-shaped Balloons: 42 x 70cm Nezuko & Tanjiro Balloons: Approximately 44 x 72cm Instructions: Inflate with air using a straw or hand pump. The balloons will stay inflated for a long time unless punctured! Aluminum balloons can be reused if you carefully deflate them. Since this is a new, unused item, returns are not accepted. Occasion: Birthday, Birthday Party, Event