Adjustable shelves, as seen in one photo. Shelves are the depth for clamshell DVD cases or CD cases. Can also be used for paperback books. (see the photo of the second cabinet that we still use.) Shelves are 5 1/4" deep.
When closed, dimensions are 40" height, Top and bottom are 23 1/2" X 12 1/2". Extra room on either side is needed to open doors.
We had extra shelves and shelf holders, but we don't know what happened to them after all these years.
The cabinet is real wood, not pressed wood, and were ordered already put together.