<p>Fill your balloons and make them fly! Balloon Helium Tank is a lightweight helium-filled tank with an 80/20 helium and air blend, comes with white string, and an easy-fill nozzle. It can fill up to fifty balloons (depending on size) to give your party a fun and festive atmosphere. Fill up balloons one to two hours before your event, and watch them fly for up to seven hours! Tank cannot be refilled. Balloons are sold separately.</p>