The 2013 Star Wars Mace Windu General Mills Mini Figure Pen is a limited edition collectible item that was included as a prize in cereal boxes. This toy pen features the character Mace Windu from the Star Wars franchise and was created as a form of advertising by General Mills. The mini figure pen adds a fun and unique element to the cereal packaging, making it a sought-after item for collectors and fans of both Star Wars and General Mills products.