Although it was an unopened item, I opened it for the purpose of taking photos. The cardboard is loosely curved (Image 4). This item has been stored at home for a long time. I don't think there's any unpleasant odor, but this is for those who don't mind these things. Akashiya Mizu-Sho Fude Pen Hiragana Practice Set Hiragana practice paper: 2 sheets Mizu-Sho Fude Pen Zipped storage bag The characters disappear when dry! Reusable!