Using this Cardfight!! Vanguard Nation’s Vault is easy. First, open the vault by gently pulling it apart against the magnet's force. Place your main deck of up to 50 cards inside the main compartment. If you have double - sleeved cards, they'll fit just fine. Put your special sleeved cards in the two protected pockets for a great display and safe storage. You can keep Power Counters or other small accessories in the drawer. When closing the vault, just let the magnet do its job and it'll snap shut securely. As for maintenance, keep it away from sharp objects to avoid scratches. Wipe it with a soft, dry cloth if it gets dirty. Also, don't expose it to extreme temperatures as it might affect the magnet's strength and the overall quality of the vault.