One 8 count package of 3.87 x 5.5 inch SpongeBob SquarePants Invitations. Includes envelopes. Invite all the crazy crustaceans on your guest list with our SpongeBob SquarePants Invitations! These colorful bi-fold invites feature SpongeBob on the front and blank spaces to write your party information on the inside. Seal your envelopes with a matching sticker for the perfect finishing touch.