Use these special foam boards around the edge of your layout to define scenery contours. Easily cut with Hot Wire Foam Cutter (#785-1435) or Foam Knife (#785-1433), both sold separately, to follow the profile of hills and other features. Special interlocking design makes it easy to stack boards to different heights and lengths. Each board (two are included in the package) measures 8 x 24" 20 x 60cm.