Just as the titular superhero has to get his vigilante gang together to fight off malicious forces, you've got to get your gang together to ensure a great time! These LEGO® Batman™ Postcard Invitations are perfect! Let everyone know the what, where and when of your birthday party, movie-watching celebration or other gathering. Paper. (8 pcs. per unit) 6 1/4" x 4 1/2" © 2017 WBEI and DC Comics. © 2017 The LEGO Group.