Using these sleeves is a breeze. Just open the side - loading slot and gently insert your standard - sized playing cards. Make sure to fold the protective flap neatly to ensure full protection. When handling the cards in the sleeves, be gentle to avoid any accidental tears. To maintain these sleeves, keep them in a cool, dry place away from direct sunlight and moisture. Regularly check the sleeves for any signs of wear and tear, and replace them if necessary. These acid - free and PVC - free sleeves are designed to last, but proper care will ensure your cards stay in top condition for a long time.