Model Railroad G Gauge DOUBLE Train Tunnel Portals - Set of 2 G Gauge Tunnel Portals Constructed with Polystyrene and Wood. Measures 18 Inches Wide X 12 Inches High ( Opening = 12 x 9) Great for G Gauge scenery, photo or movie set backdrops and mountains Other G Gauge accessories sold separately. Made with weatherproof glues and paints for outdoor garden use.