The 2021 NFL Panini Playbook Hanger Boxes are factory sealed and contain a total of 30 cards featuring players like Joe Burrow, Trevor Lawrence, and Patrick Mahomes. These standard-sized cards are made of card stock and are part of the 2021 Panini Playbook set. Each box comes with one hanger, making it a convenient way to collect and display sports trading cards. The boxes also include a variety of features like serial numbering, limited editions, and rookie cards, making them a desirable item for football fans and collectors alike.