Pirate Lab Binder Pirate Lab card binders are crafted from crush-resistant polypropylene with a hard-formed spine, reinforced with three metal rivets through the center seam, and closed with heavy-duty 1" elastic webbing to give your cards ultimate protection. Card binders are a perfect fit for unsleeved cards from many major collectible card games like Magic: The Gathering. This binder holds eighteen (18) cards per double-sided page for a total of 360 cards.