My husband liked the idea of these modular cubes for his office to complement other shelvings, but was disappointed when we received them: extremely lightweight; the back "panel" is thin cardboard that is only supposed to be glued in place with an existing pre-glued strip: needless to say only a couple of weeks later it is already peeling. We wouldn't have bought them had we seen them, in spite their good price.
Be careful with the dimensions: we did not pay attention and thought they will complement other shelvings but these cubes are really smaller, sth you don't see on the picture