Detail Accessories for 1:160 Scale Models: Retaining Walls can be arranged and assembled individually, or butted together to form a longer wall. They also can be stepped to form wing walls and made to form curved walls. Assemble with Woodland Scenics Foam Tack Glue (WD1444), Lightweight Hydrocal (WD1201), or Scenic Glue (WD0190). Color with Earth Color Pigments (WD1216-WD1223). Instructions Included. Actual height of each piece is 2-5/8" high. Each piece measures 1¾" across the top cap, and bottom measuremes 1-5/8" wide. MEETS NMRA SPECIFICATIONS!