The Subterrain Layout System consists of rigid, high-density foam products that require no power tools, hammers or nails resulting in quick and clean construction. Installing wiring and switches is fast and easy. Easily add track risers and inclines with precise grades and any radius, for reliable train operation. Create contours, roads and crossings with this complete system of products and tools. Recommended Cutting Tools: Hot Wire Foam Cutter (will emit no toxic fumes when cutting) or Foam Knife. Woodland Scenics Low Temp Glue Gun (WD1445) and Glue Sticks (WD1446). Low Temp glue will not melt SubTerrain foam. Foam Nails (WD1432) recommended to firmly hold Risers in place. Foam Tack Glue (WD1444) can also be used as a contact cement. Bonds instantly!