The 2021 Leaf Pro Set Metal Kylin Hill trading card is a highly collectible item for football fans. Manufactured by Leaf, this card features a serial number, making it a short print with only 25 copies available. Made of card stock, this rookie card from the 2021 season offers a parallel/variety design that sets it apart from other trading cards. A must-have for any serious collector looking to add a unique piece to their collection.