Instruct: Classify Amazon reviews into positive or negative sentiment
Query: So what if it's cardboard?

I wasn't expecting anything more than cardboard for the price. Other boxed sets of books come in a cardboard case. Why should this be any different? Nothing in the description says the case is wooden, and there's no reason it should be wooden. If you want a wooden case for it, have one made yourself.The books, of course, are fantastic.