The MONO Graph Mechanical Pencil is Tombow's #1 selling mechanical pencil. It 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. Lightweight yet sturdy barrel with comfortable grip. A 4mm long fixed guide pipe prevents the lead from breaking and enables users to write firmly, stably, and comfortably. Features one of Japan's most popular erasers, the MONO Eraser. Simply twist eraser to extend for use. Easy to refill both lead and eraser. Comes pre-loaded with 2 pieces of high-performance 0.5 mm HB lead.