The Kash Mayfield Leaf Baseball 1/1 Pre Production Proof is a unique and collectible sports trading card featuring the Major League Baseball player. Manufactured by Leaf in the United States, this original card is made of metal, making it a durable and high-quality addition to any sports memorabilia collection. With only one in existence, this card is a rare find for baseball fans and collectors looking for special and exclusive items to add to their collection.