The product is a 2025 Topps Chrome Cosmic Marcelo Mayer Rookie Card Special Edition (RC SSP) from the Red Sox team. This limited edition card features the player's autograph, signed by Marcelo Mayer in English on standard card stock. It is part of the MLB World Series event, with a 35 Pt. card thickness and belongs to the Starry Night insert set. This exclusive and rookie card is a sought-after collectible for baseball fans and trading card enthusiasts alike.