The 2021 Panini Chronicles Baseball Revolution Groove Inserts and Parallels set includes 20 standard-sized trading cards featuring players like Babe Ruth, Sandy Koufax, and Roberto Clemente. These cards are manufactured by Panini and are in English. The set is a collector's edition with features like printing plates, rookie cards, and parallels, all made of card stock. This product is a box containing one set of cards from the 2021 baseball season, perfect for fans and collectors of Major League Baseball.