【Why Foil balloons are better】Our Blue Letter Foil balloons are not as porous as latex balloons, which means they will stay inflated for longer. They feature a nylon material with several thin sheets of metal material over top. 【Why you should choose foil balloons】Our Blue Letter Foil balloons come in a variety of colors, shapes and styles. The ability to get a specific shape, number or character is one reason why people choose these balloons. 【Great Decoration Foil Balloon】Foil mylar Blue letter balloons are the ultimate way Whether you’re looking for your child’s favorite movie character or a numbered balloon to celebrate your anniversary someone's birthday, a business grand opening or for marketing a new product at a trade show, you’ll find it in foil balloons. 【Long Lasting】Our Blue Letter Foil balloons In most environments, foil balloons last 3-7 days. In hotter conditions, you likely won’t get as long from your balloons. When inflated well, these balloons often last approximately one month. 【Easy To Use】Easy to inflate using the a straw or an air handheld pump ,insert the straw into the inflation tube carefully, Press the self -sealing tail after finishing blowing up , If air leak occurs while inflating, please press the inflatable hole or use tape to assist the automatic sealing of the balloon. 【Size & Material】16 inch (before blown up). Our Blue Letter Foil balloons are made of good quality aluminum foil film which can be used repeatedly. (Not support Helium) . Package Included: 52 PCS 16" Foil Blue Letter Balloons 2 Sets of A-Z