Celebrate your special occasion or event with these dazzling Happy Birthday Foil Balloons! These vibrant, eye-catching Mylar Balloons instantly make a party come to life.Featured in a convenient, 5 ct.package, these Foil Balloons will stay inflated (with Helium) for up to 1 week! Mix and Match with Latex and Foil Balloons to create fun, festive balloon bouquets as easy party decorations that make a major impact! Tether your helium-filled balloons with balloon weights to make sure your balloons don't float away.