This Package Contains 4 Styrofoam Pieces of Risers that are 1" Tall by 24" Long. This is Step-1 among the simplified and improved 5-step layout system for beginners and advanced modelers. It"s a Woodland Scenics Subterrain Lightweight Train Layout System for creating an outdoor environment. FEATURES: State-of-the-art model layout system: easy, fast, fun, lightweight, precise, no power tools needed, and non-toxic. Use risers wherever track will be laid on curves and straights. Subterrain System"s precut risers remove the guesswork and complicated calculations. Incline sets are ideal for any layout, allowing smooth transition from one height to another. Incline sets (not included) add versatility and can be used with incline starters (not included) to build inclines. Optional combinations with inclines, starters, and risers allow the flexibility of making complex layouts simple. Lightweight box packaging includes extremely detailed directions. INCLUDES: One Woodland Scenics Lightweight Layout System: 4 Pieces of 1" x 24" Styrofoam Risers. REQUIRES: Foam Nails Low Temp Glue Foam Tack Glue Foam Putty 220 Grit Sandpaper SPECS: 1" Risers: Pieces: 4 COMMENTS: Subterrain manual and video are recommended for creating Subterrain Environments the Woodland Scenics way. Incline sets and starters not included with package. sdw 1/30/01 ir/jl