To use this Pokémon 9 - Pocket Portfolio, simply open it up and start inserting your standard - size Pokémon cards into the pockets. You can load them single or double depending on how many cards you want to store. Remember, the cards are not included. When handling the portfolio, try to keep it away from sharp objects to avoid tearing the polypropylene pages. To maintain it, you can gently wipe it with a soft, dry cloth. It's suitable for kids aged 6 and up, so make sure younger users handle it with adult supervision.