Laser-cut heavy chipboard. Ships flat but a breeze to put together with the slots and tabs precut (you'll just need to secure with a bit of white glue).
This item is in Dollhouse 1:12 Scale.
Approx. 4" tall x 5-3/4" wide x 1-3/4" deep.
Teri Calia made The Memory Keeper's Room (see the wide photo below). More info in the blog and/or see the supply list.