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 with Earth Colors Liquid Pigment. Set contains 6 pieces. 1 3/4 in W x 2 5/8 in H (4.44 cm x 6.66 cm) each, 140 ft (42.6 m) total scale length.