Purchased from the official website and used before starting elementary school. It helped teach the concept of numbers, and my child became good at math. The "Kazu no Renshucho" (Number Practice Book) has pencil markings on up to 5 pages, which have been erased. There is one box filled in with colored pencil (photo 6). There is a name written on the back, which has also been erased, but it is still faintly visible. Please consider this as a bonus. Price: ¥4,180