Numbers Foil Balloon in Attractive Colour. Best Suitable for Indoor and Outdoor Party Decoration. Party Decoration Becomes More Vibrant with Number Foil Toy Balloon in Different Colour. .Give your big party a personalized presentation with Foil Number Balloons! This collection of metallic balloons features every number from zero to nine, so you can mix and match to form any number. Whether you're celebrating a big birthday, graduation or anniversary, these shining Rose Gold Number Balloons are perfect for your celebration. Mix and match with coordinating foil and latex balloons, balloon accessories, solid color tableware and other party supplies for a custom party theme! Party balloons are mostly made of a natural latex tapped from rubber trees, and can be filled with air, helium, water, or any other suitable liquid or gas. The rubber's elasticity makes the volume adjustable. Twisting balloons can be used to create decor centerpieces for events and to create a more unique look than can be provided by foil balloons. Often the term "party balloon" will refer to a twisting balloon or pencil balloon. These balloons are manipulated to create shapes and figures for parties and events, typically along with entertainment. Filling the balloon with air can be done with the mouth, a manual or electric inflater (such as a hand pump), or with a source of compressed gas. When rubber or plastic balloons are filled with helium so that they float, they typically retain their buoyancy for only a day or so, sometimes longer. The enclosed helium atoms escape through small pores in the latex which are larger than the helium atoms. However, some types of balloons are labelled "helium-grade". These balloons are often thicker and has less porosity.[2] Balloons filled with air usually hold their size and shape much longer, sometimes for up to a week.