A set of 4 books to improve thinking skills. - Title: Thinking Skills Plus Course Workbook, Answer Book 4-8, 4-9, 4-10, 4-11, 4-12 - Number of books: Set of 4 - Benesse I have checked for writing and found none, but as these are used items, please refrain from purchasing if you are concerned about minor details. This is a set of workbooks and answer keys only. Due to the thickness, I anticipate that it will not fit in a compact package, so I cannot accommodate excessive price reduction requests. Thank you for viewing.