The Ryan Mountcastle RC Lot includes 20 original trading cards from the 2021 season featuring the player from the Baltimore Orioles. These cards are made of card stock and come with various features such as inserts, parallels, and refractors. Manufactured by Topps, the cards are a part of the Major League Baseball league and are standard-sized sports trading cards. With no duplicates present in the lot, this collection is perfect for fans and collectors looking to add unique pieces to their collection.