This Carrera 4/15 Curve Track comes in a twelve pack, and each 1:24 scale track piece is 7.79 inches wide. The outer diameter of the 4/15 curve is 6.56 feet and is made to fit on the outside of the Carrera 3/30 curve. 1 piece = 15 degrees, and 12 pieces = 180 degrees (half circle).