The Topps 2023 Chrome Update Mason Miller Auto RC #AC-MMI is a Major League Baseball trading card featuring an autograph from Mason Miller of the Oakland Athletics. This card is a part of the 2023 Topps Chrome Update Series and is considered a Rookie Insert. The autograph is hard-signed and authenticated by Topps, ensuring its authenticity. Made of card stock, this original sports trading card is a great addition to any baseball card collection.