Two-book set of reference books for Class 4 Hazardous Materials Handler (乙種第4類 危険物取扱者) * Published in 2021 by Takahashi Shoten * Published in 2012 by Seimido Publishing Neither book has any writing in it. They have been stored on a bookshelf, so the contents are in very clean condition. The covers have minor scratches from storage, but there are no problems with use. The 2021 edition from Takahashi Shoten is close to the latest version and is ideal for exam preparation. The 2012 edition from Seimido Publishing can be used for basic understanding and reference materials. This is a recommended set for those who will be taking the Class 4 exam. Please check the condition in the photos.