Named after Civil War general William Tecumseh Sherman, the M4 Sherman was the most widely used medium tank in World War II. Retro 51 pays tribute by incorporating the armored look to the Big Shot Tornado pen design. Acid etched to create the textured grooves and tank treads, the Sherman is then printed with army green and white. The knurled twist-top, clip, and front nose cone are antique-finished to complete the design.