These book cases are super sturdy, deep, and tall. Metal structure with solid wood shelves that have wooden supports underneath each shelf.  Overall, the look is clean-industrial.  It took me about 15 minutes to put one of them together, all I needed was an Allen wrench.  I bought two of them and have had them for over a month now next to my standing desk at work.  Each shelf is holds at least 50 lbs of books and wine.  I'm very happy with this purchase.