Balloon measures 18 inches; can be repeated use, convenient inflation and deflation. Use a medium width drinking straw and insert it into the self-sealing valve of the balloon then start to blow it.; inflation gas: normal air or helium; solid. Perfect to accessorize any party perfectly; material: foil. Uses microseal technology for strong and longer lasting seal with a seamless appearance.Package Includes: 5 pcs 18" inch Rose Gold Star Shape foil balloonsPerfect for Engagement, weddings, Anniversary decorations, birthday party decorations, Baby Shower, photo posing, Christmas, Halloween, Carnival Party, Graduation and any other party decorationEasy enough to inflate yourself with a regular drinking strawWide application: these star balloons are suitable for planing surprise party for wife, husband, or any couple who want to celebrate their big day, good additions to your valentine's day party, anniversary, wedding, surprise proposal event or even use it as a home or office adornment