First off, this isn’t actually concrete.  It’s possible the specifications already say that and I just missed it, but I did want to make that clear.  I think it’s some kind of acrylic material.  That said, it actually looks really cool.  Very unique and stylish.  I was a bit worried that it might tip easily - it seems a little top heavy - but our rambunctious cats have been putting it through its paces for the last few weeks and we haven’t had a single issue.  Would definitely recommend this piece.