United Visual Products' Mini Letterboard Outdoor Message Center offers a durable way to display messages on your park. Heavy-duty polyethylene stands up to harsh weather and won't rot, splinter or crack. The top mounted, full-length piano hinge door and removable vinyl letterboard make it easy to arrange your message. Use the two included keys to lock the door and keep your message safe. This message center attaches to a wall or single post (sold separately). Includes a 290-piece 3/4-inch Helvetica letter and number set. Choose from six natural frame colors.