This product is excellent and worth more than its cost. The metal material is sturdy; it is really, really easy to put together. As simple as matching 1 to 1, 2 to 2, ... 15 to 15 (all the parts are labeled with numbers).  We initially laid out the parts like the diagram, but quickly found out the aforementioned. No better way to show appreciation for this product than a happy sleeping tween!