These are Made of high quality aluminum foil, about 16 inch in size, thick and auto-sealing, no leaks, can last for days when inflated. Give Your Big Party A Personalized Presentation With Foil Balloons! This Collection Of Metallic Balloons Features Every Alphabets From A to Z and Numbers, So You Can Mix And Match To Form Any Number Or Name. Whether You'Re Celebrating A Big Birthday, Graduation Or Anniversary, These Shining Happy Birthday Gold, Silver,Black, Blue, Pink, Red, Rose Gold foil Balloons Are Perfect For Your Celebration. Mix And Match With Coordinating Foil And Latex Balloons, Polka dot balloons & balloon accessoriesType: BalloonDesign: AlphabetFor all kinds of birthday celebrations. Wish your loved ones a very happy birthday in style. Available in multi colors and VariationsColour: GOLD & BLUEAvailable Happy Birthday Alphabet Letters