This Anagram 50th Anniversary Balloon measures 18" and is made of foil. Its a perfect add on to any bouquet or for decor at the 50th Anniversary party. WARNING: CHOKING HAZARD - Children under 8 years can choke or suffocate on uninflated or broken balloons. Adult supervision required. Keep uninflated balloons from children. Discard broken balloons at once. NOTE: Balloons Arrive Uninflated.