There is no option for NO STARS.  
This shelving unit is a piece of junk.  Wayfair should be ashamed to have this in their product line.  I've bought multiple items from Wayfair over the years and this is probably the only time I've been truly disappointed.  The shelves themselves are less than 3/16 of an inch think, and look like heavy cardboard.  I will pay the cost of return shipping only because I have NO place in my home that I would even use this unit.  
Oh, and the first customer representative hung up on me as I was explaining the problem.  The second and third representatives were pleasant but unmoving on their return policy.  DO NOT BUY THIS SHELVING UNIT.