The MONO Graph Mechanical Pencil features an innovative shake-mechanism that lets you extend the lead by simply shaking the pencil. The pencil's clip is equipped with a shake lock that prevents accidental lead extension. A fixed guide pipe prevents the lead from breaking, so you can draw and write firmly, stably, and comfortably. Features the popular Tombow MONO Eraser. Refillable lead and eraser available. 0.5mm lead.