Mark the Dark Age with the eve of human history by Homo Sapiens collection...Invention of writing instruments with pure basaltic lava catalysed together with resin in a formula – patented thus obviously kept secret - whose extraordinary characteristics practically transforms it into a material giving a shape to the formation of Visconti Homo Sapiens Rollerball Pen - Dark Age in Oversize. Note: The Lava material is a natural material; when daily used, the pen keeps its original dark grey color. If the pen is not used for a while or exposed to strong light it can become light grey. This is a certification of a real bio material. To regenerate the material, it is simple: just treat the pen with a common moisturizer.