Who's afraid of turning 40? Not your birthday guest. Add the 40th Birthday Mylar Balloon and show it off. This foil party balloon measures 18" when inflated and features multi colored dots on a black background and a large number 40 made out of balloons in the center. This metallic balloon can be combined with any of our other Balloon 40th Birthday party supplies. With wholesale pricing and bulk quantities, our Balloons 40th Birthday Mylar Balloons 10 ct are perfect for event planners, caterers, and home hostesses alike.