These diorama boxes are laser cut from sturdy chipboard. Overall approx. 6-1/2" tall by 4-1/4" wide by 1-1/2" deep (plus dividers that create four approx 2" wide x 2" tall "rooms").
The "rooms" work well for 1/4" scale (1:48) furniture (see 2 photos below).
Assembly is required, but it's super easy with a slat and groove system. You'll need to apply quality glue to keep everything in place.
Note: Items cut from this heavy, light-grey chipboard burn easily so the laser-cutting process may leave charcoal residue behind. Save yourself a headache, and just wipe the cut edges of these items down with a dry paper towel before assembling or painting.
Also shown below with a larger version, and with a die-cut silhouette that fits the "attic" (both linked below).