This product is advertized as being made of wood. However it is really made of composite wood or MDF. I wanted to avoid purchasing products made of such material due to their formaldehyde content and contribution to indoor air pollution. However, I do like the style of these bookshelves. I bought two and they look very nice side by side. The walnut is a very dark brown; somewhat darker than the photo. They were slightly more than I would have paid had I known they were not made of solid wood (about $**** each). It took me about 1 hr to put it together. The Allen wrench or Hex key provided was a bit cumbersome. For the send shelf unit, I used a hex head bit with a power drill and it cut the assembly time in half.