I purchased these and stored them in a dark place. 5 new, unused sets. The front is blank. The back is designed to categorize English words into nouns, intransitive verbs, transitive verbs, adjectives, and adverbs by checking the corresponding boxes. I collected these as a hobby at the time, but I'm selling them because I'm no longer an otaku. I've kept them in storage since I bought them. Please understand that these are stored at home, so those seeking perfection should refrain from purchasing. There are no smokers or pets.