Show your gratitude to all your friends for all of their help in defeating evil (or for presents) with these LEGO® Batman™ Thank You Postcards! They're perfect for birthday parties and for thanking your friends for joining you on movie night. Find more LEGO® Batman™ party supplies on this website. Paper. (8 pcs. per unit) 4 1/4" x 6 1/4" © 2017 WBEI and DC Comics. © 2017 The LEGO Group.