The Walthers Cornerstone Truck and Railroad Docks kit is an easy way to add modern loading dock doors to your N Scale layout′s industrial structures. Each set includes modern roll-up doors and appropriate bellows-weather seals to replace loading doors on older buildings. Modernize any industry in minutes - great for kitbashing and customizing! Includes correct size doors and weather bellows/seals for four truck docks, two drive-through and two railcar loading dock doors Molded in two colors - matches parts in Walthers N Scale tip-up concrete structure kits