To use these sleeves, simply slide your cards into them one by one. Make sure to insert the cards gently to avoid any damage. When handling the sleeved cards, try to keep your hands clean to prevent dirt and oil from getting on the sleeves. For maintenance, you can wipe the sleeves with a soft, dry cloth if they get dirty. Avoid using any harsh chemicals as they may damage the matte finish. Store the sleeved cards in a cool, dry place to keep them in good condition.