The MONO Graph Mechanical Pencil features an innovative shake-mechanism that allows the user to extend the lead by simply shaking the pencil. The pencil’s clip is equipped with a shake lock that prevents accidental lead extension. A 4mm long fixed guide pipe prevents the lead from breaking and enables users to draw and write firmly, stably, and comfortably. Features one of Japan’s most popular erasers, the MONO Eraser. Refillable lead and eraser. 0.5mm graphite lead.