MrTrain.com model train scenery features this 12 inch retaining wall which is built in our Western Pennsylvania workshop. This miniature retaining block wall measures 12 inches by 4 inches by 3/4 inch thick. Made from polystyrene foam & painted gray. The block wall features are located on the front and the top, while the back is painted black.  This accent scenery is great for model train railroad layouts, dollhouses, diorama, and other craft projects. It will withstand outdoor elements and is very lightweight.