This balloon is designed to be inflated with air only and does not float with helium. This 111cm Party Script - Holographic (Airfill Only) foil mylar balloon is The ultimate decoration piece for your themed party! Made by Northstar, this shaped cursive letters balloon is a great decor piece to hang from the ceiling, attach to the wall or build into your themed decor. This balloon includes a self-sealing valve, preventing the air from escaping after it's inflated. Balloon does not float and must be inflated with air. Balloon arrives uninflated.