ThinkGeek The Walking Dead Merle Knife Hand Prop Replica Do you have what it takes to defeat zombies in a post-apocalyptic world? From the hit AMC television series The Walking Dead comes The Walking Dead Merle Knife Hand Prop Replica! This plastic prop replica of Merle Dixon's prosthetic arm with bayonet is great for roleplaying as your favorite character from the show. Measures about 22 1/2-inches long. Ages 14 and up.