Order arrived more quickly than promised, well-designed and cleanly crafted shelves were easy to assemble without help. However, once I was able to assess the load-bearing capacity of the  shelves with the product in hand, I realized that one has to pay close attention to the weight limit noted in product description. These shelves are not made of wood.  I had planned to stack a fully-loaded, wooden, open "tic-tac-toe" CD shelf on top of the Wayfair CD shelves. Change of plans:  I  placed a narrow wooden board on top of the Wayfair shelves in order to distribute the weight of the topper shelf.  Then the Wayfair CD shelves worked just fine as a foundation.  See photo. Very pleased with product and result.