The Library on the Ghostbusters Premium and LE is a nice molded Library from the factory.  These beautiful hand painted trees look great on either side of the library.  The vibrant colors match the playfield style and color.  These trees can be ordered in Green or colored ( Yellow and Magenta ).  If you own the Pro machine, I offer a molded library separately that looks great with the trees.  Made from solid resin and clearcoated for added durability.