Using this Cardfight!! Vanguard Nation’s Vault is easy. First, open the box by gently pulling against the magnet. You can place your main deck of up to 50 cards inside the main compartment. If your cards are double - sleeved, no problem, it still fits. For your special sleeved cards, put them in the two protected pockets. You can arrange them in a way that makes it easy to show them off. Use the drawer to store your Power Counters or other small accessories like dice. When closing the box, just align the lid and let the magnet do its job. As for maintenance, keep it away from sharp objects to avoid scratches. Wipe it with a soft, dry cloth if it gets dirty. Don't expose it to extreme heat or cold, as this could damage the magnet or the box material.