The circus is here and is ready to party! Welcome guests to your carnival-themed event with this awesome stack of balloon boxes! Fill up some balloons (sold separately) and stuff them in each box to create an eye-catching display for your party. Find more decor and supplies that will make your carnival the talk of the town on this website. Cardboard. (3 pcs. per unit) 11 1/2 x 11 1/2 x 11 1/2 – 17 1/2 Balloons sold separately. Simple assembly required.