Instruct: Classify a review into positive or negative sentiment.
Query: Are they made of cardboard?!!

The design is good, but they are made of a poor quality material. It is almost impossible not to crack them when mount the screws.They better made the supports of real wood. The manual instead contains a lot of good quality paper and many pages of instruction as for a dvd player :))), at least.Also, the parts are extremely carefully packed, but ...I do not recommend this product to anyone.