I've no idea actually, I believe it's true wood though, not that board stuff. It may be heavier, I only moved it once and after it was brought into this room I never wanted to move it again. It's definitely not too uneven, not compared to what my 20 was on before I got a stand for it. Each board on the stand is like three inches thick. It feels pretty sturdy but I constantly worry.
It seems pretty heavy duty although I probably will end up replacing it alltogether as the doors are a bit rusted so I'd assume there is some water damage. I like having it since it was my father in laws and he's pretty happy I'm using it although if I tell him it's unstable and creaking he will understand since we have a two year old in the house.
For the first week or so I can't tell you how worried I was. The first time I saw my son go under that tank filled with water I about died. My husband lol "Oh it's fine" theeeeen I explained how heavy it was with water and the glass.. not so fine :p
The only time I notice the creaking is when I take out more than 15 gallons. With 10 gallons I don't usually hear anything and I very rarely take out more than 10 but because my ammonia and nitrites were a bit high I changed as much as I could :3
Thank you so much for your help and replies :D