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 A to Z silver foil Balloons Are Perfect For Your Celebration. Mix And Match With Coordinating Foil And Latex Balloons, Polka dot balloons & balloon accessoriesType: Foil BalloonDesign: Letters / Alphabet BalloonFor all occasions including birthday, anniversary, mothers day, valentines day, shower party, new year, kids birthday, Christmas partyColour: SILVERAvailable, Silver Colour Alphabets / Letters From A to Z