This working casement window includes acrylic panes and an outer sill. It has no interior trim. Each window is pin-hinged to operate separately and opens outward. It measures 3 7/8" W x 2 7/8" H and fits an opening of 3 7/16" W x 2 11/16" H x 1/2" D. It is 1/12 scale, which is the most common scale for dollhouses and dollhouse miniatures. It means that if an object is 12 inches in real life, it is sized down to a one inch as a miniature.