This is a heavy duty shelving unit. It holds a ton of my items that I have in totes. It is extremely sturdy. Despite other reviews, this item was very simple to put together. I was able to do it by myself. I didn't need an extra set of hands. All I needed was a rubber mallet. BTW I am a woman. Everything went in easy. All of the shelves are completely adjustable. They are made out of compressed wood chips. If I need another shelving unit I would definitely purchase this one again.