The product is a set of Deathwatch datacards for Warhammer 40k, produced by Games Workshop. These datacards are specifically focused on the Deathwatch chapter/regiment and serve as reference aids for players in the Warhammer 40K game. The fact that the item is out of print (OOP) but still sealed indicates that it is a sought-after collectible for Warhammer enthusiasts who are looking to enhance their gameplay with this specific chapter/regiment.