Write literally forever in metal with the Inkless Pen. It features a metal alloy tip that lays down grey markings resembling pencil marks but are permanent and smudge-proof. It does not require sharpening or refilling. As there is no "ink," it will never dry up or leak. The metallic barrels are made from anodized aluminum. Please refer to the last photo for the weight and color of the lines this pen produces.