This is a set of the English learning materials "DUO select" and "DUO select CD." I purchased it, but I have hardly used it at all. It's a textbook that allows you to learn vocabulary and idioms through example sentences, and is suitable for studying during spare time, such as commuting to work or school. [Set Contents] ・DUO select (book): 1,254 yen (tax included) ・DUO select CD (4 CDs + booklet): 3,080 yen (tax included) ・Total: 4,334 yen (tax included)