I am completely addicted to adult coloring. Wishing to complete my collection, I threw myself into this purchase for a stupid criterion: the hedge is in hardcover. For the price of 9.90, it is great to find such quality, whether for coverage but also the quality of the pages since the pencils do not pass through the paper (I've tested only with paper Use of Stabilo pen 88). The major downside in my opinion, is that some are beautiful coloring, but it seems difficult to me to color because the amount of black ink already used previously to perform the drawing is too large, which gives the impression that the design has already ended even before coloring. In addition, coloring spread over the whole page, it may be difficult to have access to details about the back, the cardboard cover preventing flexibility. Beyond that, the drawings are very varied, some are quite unique and not found in the other books available from publishers. This is a very good value for money.