Foil Mylar Balloon, empty balloon is 42 inch, after filled with helium or air, it's 40 in 15 balloons, Rose Gold number 15 foil mylar balloon 40 in tall rose gold helium number balloon Happy Birthday Decorations, inflated with helium or air, use straw or air pump, straw included Number 15 Mylar Balloon is perfect for decorating a birthday party or 15 years anniversary, birthday party decorations Jumbo foil 15 number balloons, Can be repeated use, convenient inflation and deflation