Tombow's Graph 0.5mm mechanical pencil looks smart and feels good to use. The 4mm long guide pipe supports high precision writing and its shake knock mechanism allows you to advance lead without losing your grip. Just shake the pencil while holding it and the right amount of lead is now available.
The pen clip on the side functions as both a secondary lead advancement mechanism (pushed down) or a lead shake lock (pushed up).
Tombow's most popular MONO eraser is attached at the top of the pencil's twist-telescoping mechanism, providing greatly improved erasing performance. The eraser top also pops off for lead refilling.
Add on the eraser refill pack and you'll be set for study. Takes any 0.5mm replacement lead of your choosing.