There are 36 books. The product is a set of 6 units from the Grade 9 Reading & Writing Companion series by McGraw Hill. These units focus on reading and writing skills, with a focus on language arts and disciplines. The textbooks are in paperback format and are designed for high school students at an intermediate level. Published by StudySync, the units cover a variety of topics within the subject area of English language arts. Each set includes 6 units for students to use to enhance their reading and writing abilities.