I have kept this item mostly unused since I purchased it, so I don't think it feels very used. There are no writings, but there may be some light stains or folds due to aging, so please purchase only if you understand. I will ship via Yu-Packet Post. Due to the thickness, it is likely that cushioning material cannot be added. Thank you for your understanding. Please purchase if you understand that this is a used item. ********* A theory book for the 3rd class of electrical engineers, explained in an easy-to-understand manga format. - Title: Kore Dake Theory 1 (Just This Theory 1) - Author: Chihiro Ishibashi - Series Name: Kore Dake Series (Just This Series) - Genre: Science/Engineering - ISBN: 978-4-581-17109-1 - Price: Regular price 2,600 yen - Illustrations: Manga format - Features: Easy problem explanations, compatible with the 3rd class of electrical engineers Thank you for viewing.