This is a **Muji Cotton Mother and Child Health Handbook Case Refill (Small)**. It's A6 size compatible and comes in a set of 3. In our home, we use it not only as a mother and child health handbook case, but also for adult medicine notebooks and health insurance cards. It's thin and lightweight, making it easy to carry around, and it's very convenient to have one per person. It has a D-ring, so it's also recommended to attach keychains, etc., to each family member for identification. *Please note that this item is stored at home. If you are concerned about minor details, please refrain from purchasing.*