Celebrate a special birthday with everyone's favorite Sesame Street character, Elmo! Our Elmo Head Helium Shape Balloon measures approximately 20'' in diameter and is made of foil. Perfect to use for 1st birthday's, Sesame Street themed parties and more. All of our balloons are shipped flat and can be inflated with helium with a helium tank or at a local party store. 1 Elmo Head Helium Shape Balloon is included per package.