Sesame Street 1st Birthday Party Invitations and Thank You Postcards measure 4" x 5 1/8". Our Invitations feature Baby Cookie Monster, Baby Big Bird and Baby Elmo along with "Please come to my 1st birthday party" on the front. The inside message has a printed number "1" headline on one side, and the other other side contains spaces for invitee's name, date, time, place, please call info. Our Thank You Postcards feature Baby Elmo with number "1" headline along with "Thanks!" on the front. Each package comes with 8 invitations, 8 thank you postcards and 8 white envelopes.