●1. They use high quality materials that are practical and durable for long term use ●2. It can be expanded, so it is easy to store and carry ●3. They can make your life more convenient and save your time ●4. Insert the standard size time card and the name will be seen, so it is easy to find the card ●5. Can be stored repeatedly for cards and other materials, suitable for classrooms, offices, kitchens, warehouses, etc