Round out your lofty assortment in black. Our solid Black Round Foil Balloon exudes festive fun and everyday dramatic appeal. Mix with your favorite patterns to create your own custom balloon bouquet. This 2-sided foil balloon measures 18in in diameter. WARNING: CHOKING HAZARD - Children under 8 yrs. can choke or suffocate on uninflated or broken balloons. Adult supervision required. Keep uninflated balloons from children. Discard broken balloons at once.