$4.50
Opening Size: 1-3/8 x 3/16 x 3-5/16
Outside Size: 1-9/16 x 3/8 x 3-1/2
And from Jackson Miniatures website:
these smaller doors and windows are made from high quality injection moulded white styrene and can be painted easily using ordinary hobby paints if you would like them to have a different appearance. (We recommend you start with a matte undercoat to stop the top coat "beading".)