Use Retaining Walls alone, installed adjacent to each other to create straight or curved walls, or use with Tunnel Portals. Cut to varying heights to create stepped, winged walls. Color easily and realistically with Earth Colors Liquid Pigment. Meets NMRA specifications. Set contains 3 pieces. 3 1/8″ w x 5 1/4″ h (7.93 cm x 13.3 cm), 67 ft (20.4 m) total scale length.