This is the complete set of New Concept English Self-study Handbook Vol. 1,2,3,4 Chinese Edition. The books are still sealed and have never been opened. They are written in English and are perfect for language learners who want to improve their English skills. The set comes with four books and is ideal for self-study. The author of the books is unknown and the original language is Chinese. This set is a great addition to any book lover's collection.