Make your party decor pop with our 4 foot 3D Balloon Number 21 Set! The large, freestanding cardboard number props have an open front and come with two colors of balloons for you to add inside each number. If we don't have the color choice you're looking for, you can purchase additional balloons separately in the colors you need. These giant mosaic balloon numbers have a new and improved, easy-to-use tab design. We even supply the hot glue gun and glue needed for assembly.