It's MDF with an extremely thin veneer of (maybe) cedar.
I tried to make these cheap China humidors work many years ago. I would silicone in a piece of plexiglas on the bottom, because the bottom is only 1/8" thick pressboard. Essentially open to air.
The lid I would pull off all the slats, apply glue, and use small screws to reattach to the lid, and then seal the corners. Glasstops I pulled everything off and glued the glass in place.
In the bottom I left some as is, others I put in proper Spanish Cedar. Didn't seem to make a difference either way though.
They performed much better than as they came, but not as good as a proper wood desktop humidor. ultimately dropped several hundred on a quality one and have been using it for years.
Most of my cigars though, are stored in a cedar lined Pelican case with a ton of Boveda packs and 2lbs of heartfelt beads. The desktop needs a lot more maintenance, about every 2 months I need to rotate the Bovedas out for rehydration. The pelican case gets water added maybe once a year.
If you really want a pretty display piece, spend $6-800 on a quality piece. Or run the cheapos with a couple weeks worth of smokes, but don't rely on it for storage. For longer term storage it's hard to find an argument against watertight box like an ammo can or a Pelican case or similar while running proper 2 way humidification systems.
