Trading Card Holder Hard Plastic Sleeve, a pack of 20 rigid, clear plastic holders for protecting trading cards. The stiff shell keeps a card flat and shields it from bent corners, scuffs and everyday knocks, while the clear front and back leave the card fully visible for display. A card slides in from the top, so the holders suit collectors who store cards in a box, carry them to a trade or show off a favourite. This is a new accessory.