Using this double deck holder is easy. First, open the lid using the wide - opening Cobra Neck technology. Then, place your double - sleeved cards into the removable inner deck holders, up to 100 cards in each. You can store two complete decks or up to 200 cards in total. For oversized cards, just put them in as you would with regular ones. When it comes to maintenance, keep it in a dry place away from direct sunlight to prevent the color from fading and the material from degrading. If it gets dirty, use a soft, dry cloth to wipe it clean. Avoid using harsh chemicals as they may damage the holder.