Pink Sparkle Happy 21st Birthday Balloon If you know a girl who's celebrating their 21st birthday soon then this foil balloon is a great idea! With a holographic pattern and the words 'Happy 21st Birthday' on the front, this birthday balloon is a great way to show off the special occasion. Please be aware that our foil balloons are not already inflated when we ship them. We recommend you obtain some helium from a party accessories shop, but they're also great when inflated the conventional way! 18" (45.7 cm) round foil balloon. Comes with tying ribbon. Please note: This balloon is not supplied inflated. Manufacturer's Warning: Possible choking hazard - Never leave young children unattended with balloon.