This is the Metcalfe PO235 OO/HO Stone Platform Kit

An extremely versatile platform kit that can be built to virtually any shape.

You can make any of the following from this kit:

Straight Platforms
Curved Platforms
Island Platforms
Bay Platforms

Pre-cut components build up in a box type structure to give rigid realistic platforms.

Kit contains enough components to build up to 7ft in length (based on an average platform width of 3 inches and 30% wastage).