The Pokemon Steam Siege 2 In 1 Booster Packs feature a total of 20 cards from the XY - Steam Siege set, perfect for collectors and players of the Pokemon Trading Card Game. Manufactured by Nintendo in 2017, these packs contain standard-sized cards made of durable card stock. Each pack comes with a collectible pin, making it a must-have for any Pokemon TCG enthusiast. Whether you're adding to your collection or trying to complete your set, these booster packs offer a fun and exciting way to enhance your gaming experience.