Using this card holder is easy. Just open the folding pouch and place your cards in the two pockets. You can put in up to 4 cards, like your travel pass for your daily commute, your bank card for shopping, or your ID for identification. When you're traveling, it's a great way to keep important cards organized. As for maintenance, you can simply wipe it with a soft, damp cloth if it gets dirty. Avoid using harsh chemicals as they might damage the PVC material. Also, don't bend it too forcefully to prevent it from breaking.