These bookstacking mods look great right over the book insert on the game.  These multi colored stacks of books are hand made and assembled together  with a steel post through the center for added strength .  A custom shaped steel bracket is painted black and blends in well with factory brackets. Two versions to choice from.  Solid books or printed covers.  The printed cover version is slightly larger than the smaller books.   Easy installation.  A nice simple mod that really enhances the empty area right in the middle of the playfield over the captive ball area.