Aluminum,Straw?? WHAT YOU'LL GET - Each set includes 13 letters of gold 16 inch letters spelling HAPPY BIRTHDAY, a straw to help you fill them up with air and a long hanging ribbon for walls or ceilings(br)Happy birthday balloons for any age birthday party You can hang the banner from the ceiling, tape it to the wall or drape it for a party backdrop or a DIY photo booth(br)?? QUALITY & WORTHY MATERIALS - Our Happy Birthday Balloons Banner is made of high-quality aluminum foil, color uniform,spherical beautiful(br)It is secure to use, strong and long lasting(br)??EASY TO INSTALL & REUSABLE DESIGN: Use the plastic straw inflate the gas slowly until 90% filled for an easy party decoration(br) These aluminum foil balloons are self-sealing(br) When the inflation is completed, the ball comes automatically sealed These balloons can be deflated for reusing next time(br)??WIDELY APPLICATION: Perfect for decorating the babies, kids, adults birthday party with this lovely 'HAPPY BIRTHDAY' Foil letter balloon banner(br)Use for birthday, birthday party, wedding, baby shower,outdoor party, home party, celebrations and other on-site decoration(br)?? PERFECT PARTY DECORATION- Make a statement at your party with our stunning Happy Birthday Balloons Banner; Instantly, it will set the mood and give your guests permission to cut loose;There's no such thing as too much shine Warm tip: Please keep away from fire(br)