Particle board, this side up arrows missing on parts, instructions not clear, assembly was complex for top part of sideboard and layered so that I could not go back and re-tighten connections.  
I ended up with one part upside down and therefore could not screw it in, but could not go back to turn it right side up.     
I don't believe that this piece matches the quality or value that Wayfair has a reputation of supplying in their products.