This roadbed is designed with a more realistic 30-degree slopes found in many actual railroad roadbeds. The scale dimensions are 6" high, 11'-6" across the top and 14'-9" across the bottom. Actual dimensions are 6.35 mm thick (approx. 1/4"), 10.1mm across the top (approx. 3-15/16" ), 11.11 cm across the bottom (4-3/8") and 32" long. Minimum radius for the bendable products is 24". Roadbed is sold in 8' bundles. You receive a bundle of 9 strips, 32" long for each 8' of roadbed ordered. Roadbed is in thirds, so 9 pieces make 96" or 8' of roadbed. This roadbed is designed so that laying it side to side will yield 4-3/8"" track centers.