The Retro 51 Hex-O-Matic Ballpoint Pen. The Retro 51 Hex-o-matic is, as the name suggests, shaped like a hexagon. The faceted metal barrel is sleek and straight. The rounded texture grip allows for comfort and non slip handling making it feel great when held. It has a click top for retracting the point to reduce the chance of drying. The matte silver or white finish gives this pen a very retro look.