These landscaped landforms are ideal for model railroad, war gaming and traveling layouts. They are economical, mess-free and ready to set in place. Tunnels and Rocky Ridges complement ReadyGrass Vinyl Mats, blend with any layout and work for any number of projects. 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. Specs Scale: N 1/160 Size: 16-1/2L x 10W x 5H (419mm x 254mm 127mm) Portal opening: 1-3/8W x 1-3/4H (35mm x 45mm) Requires Adhere tunnel to layout Hydrocal, flex paste or white glue Hobby knife, sandpaper or file Earth color liquid pigments