GET ORGANIZED: Whether you’re using them for studying, notes, or games, our blank flash cards are great for a myriad of uses. These durable cards can be customized and are perfect for writing with markers, pens, or pencils. EASY SORTING: Each card is hole-punched. The included metal rings make it easy to sort cards however you like and ensure you’ll never lose a card. The colored cards included are perfect for sorting or categorizing cards as well.