One 13 inch x 19 inch Hammer Down Biker Birthday Party Poster. This poster is printed on high-quality satin sheen paper and was created by Moxzie, Inc. to coordinate with our Harley Davidson Party Supplies. Place your Hammer Down Biker Birthday Party Poster on the wall behind the food table for pretty pictures. Let guests know where to stop by fastening one of these friendly posters to your front door. Try attaching Hammer Down Biker Birthday Party Posters to wooden dowels and placing them in your yard for a unique display.