This assortment contains one sprue of every door, window and structural part from parts number 8092 through 8133 for a total of over 130 pieces! This is four of most windows, three of most people doors and one of most freight doors. It is intended to be a comprehensive physical catalog allowing you to design and build scratch built structures. Refernec pages are included. I can spoecial order any Tichy part you will need!