Graph Gear 500 Automatic Drafting Pencil (0.5mm), Black Barrel Pentel Co., Ltd. is a privately held Japanese company which produces stationery products. The name is a combination of the English words pen and tell. Pentel is also the inventor of non-permanent marker technology.
From the Manufacturer
GraphGear 500 technical drafting pencil features a 4mm fixed sleeve for template work and technical drawings. Metallic-mesh grip delivers precision and control. Drafting pencil offers a top click, stationary eraser and tip. Refillable with Pentel Super Hi-Polymer Lead and Z21 refill eraser.