1-Panel flat door has simple, clean lines to accommodate a wide range of architectural styles. ProCore solid particle board interior core reduces sound transmission by up to 50 percent compared to a hollow core interior door. Stained door has the rich, warm look of wood, with less maintenance. Factory applied stain is brushed on and finished with a clear, protective coating. Door is prehung in frame for easy installation. Left-hand is when the knob is on the left and the door opens toward you. 5