Textbook and problem set for the Class 4 Hazardous Materials Handler (Otoshu Dai 4-rui Kikenbutsu Tor扱い者) exam. - Title: Pass on the First Try! Class 4 Hazardous Materials Handler Textbook & Problem Set - ISBN: 978-4-8152-0771-4 - Price: 1200 yen I'm selling this because I no longer need it. It's been stored in good condition, so you can read it without any problems. #Class4HazardousMaterials Thank you for looking.