Aluminum foil YOU WILL GET:10 PCS 18 foil letter balloons Premium Quality Foil Balloon: Birthday balloons made with high quality shiny aluminum foil, strong and auto-seal, without leaking and losing air. Bright, Vibrant Mylar Our premium quality balloons are crafted with a durable, ultra-shiny aluminum foil that maintains form without leaking or losing air. The foil letter balloons are fast and easy to inflate using the plastic straw included in the package. Simply tape it or use the ribbon to hang the letters on the wall, window, curtains, ceiling, backyard or anywhere else you think it will look great, indoors or outdoors. Everything you need to celebrate special moments and build great memories with your kids, family and friends. Imagine how much fun you will have throwing a surprise party for your loved ones or just decorating your own birthday party.