The 2021 Topps WWE Walter (Gunther) NXT Authentic Event-Used Mat Relic is a collectible sports trading card featuring the wrestler Gunther from the WWE. This card, part of the 2021 Topps WWE set, showcases an authentic event-used mat relic, making it a unique and valuable addition for fans of wrestling memorabilia. The card is not autographed but still holds significance as a piece of authentic wrestling history for collectors and fans alike.