Key FeaturesEasy to color plaster castingOne portal per packageOutside measurement: 8-1/16″ x 5-1/4″Inside measurement: 4-3/4″ x 3-7/8″OverviewGive your tunnel a Cut Stone face. This double portal fits over two N scale tracks. Color with Earth Color Liquid Pigments. Outside: 4″w x 2 13/16″h Inside: 2 9/16″w x 2″h.