Anagram 41" Frozen Olaf Foil Mylar Balloon 28316 Includes Self Sealing Valve - Self-Sealing Valve Prevents The Gas From Escaping After It's Inflated. Inflate With Helium Or Air - The Balloon Can Be Inflated With A Helium Inflator Or With Air Using A Balloon Air Inflator. Balloon Comes Uninflated. Mylar/ Foil Balloon.