This is the N Scale Curved Tunnel for Your Model Railroad Layout from Woodland Scenics. FEATURES: This flexible tunnel is realistically painted Two shades of grass on the sides and brown gravel on the top of the tunnel Tunnel portal is painted gray Tunnel is designed for an 11" radius but allows for 9-3/4" to 19" radius Ready to use INCLUDES: One N Scale Curved Tunnel REQUIRES: Adhere tunnel to layout Hydrocal, flex paste or white glue Hobby knife, sandpaper or file Earth color liquid pigments SPECS: Scale: N 1/160 Size: 16-1/2"L x 10"W x 5"H (419mm x 254mm 127mm) Portal opening: 1-3/8"W x 1-3/4"H (35mm x 45mm) COMMENTS: Hydrocal is a product of U.S. Gypsum. For further information on installing tunnel portals, as well as complete instructions for creating landscape and terrain, read "The Scenery Manual" (WOOU1507). tlw 12/13/07 ir/jxs