Tombow Mono Graph mechanical pencil features one of the most popular erasers in Japan, the MONO eraser. To prevent the lead from breaking and to help with precise work, MONO graph has a 4mm long guide pipe. Features an innovative shake-mechanism that allows you to extend the lead by simply shaking the pencil. You can also advance the lead by pushing down the clip. Equipped with a lock mechanism to prevent accidental lead extension. Utilizes standard 0.3 mm lead refills. Refillable Mono eraser rotates out of the cap.