Super detailed castings of highdensity Lightweight Hydrocal make up these six Tunnel Portals Designed for ease of use readytostain single & double width Portals are available They come in the same styles as Retaining Walls & can be used alone or in combination with Retaining Walls Available in HO & N scale The Tunnel Liner Form is for casting realistic rock walls & ceilings for scale tunnels on your pike It is designed to form half of either a single or double liner section with each pour of Lightweight Hydrocal HO scale Purchase the Scenery Manual for additional information on how to use the Landscaping System Color with Earth Colors Liquid Pigments