This is a set of three books from Z-Kai Publishing: Sokudoku Eitanngo (Speed Reading English Vocabulary) Introductory Edition, Essential Edition, and Advanced Edition. These are standard reference books useful for English language learning. [Brand] Z-Kai Publishing [Category] English Vocabulary Reference Books [Contents] Sokudoku Eitanngo Introductory Edition, Sokudoku Eitanngo Essential Edition, Sokudoku Eitanngo Advanced Edition There are some scratches and folds on the covers, and some writing inside, but they can be used for studying without any problems. These items have been stored at home.