This is used on one window only, usually 1 layer for sheet and 1 layer for curtain * 2 white aluminum curtain track 8 Feet (Track is 1 inch tall and 3/4 inch wide). * 2 pair of white master carrier, 4 batons (30 inch long) with baton adapter * 50 white ball bearing carriers * 4 metal end stops, 4 white wall mount double brackets