Tombow Mono Graph Shaker Mechanical Pencil 0.5mm.

This modern and stylish mechanical pencil is chock-full of cool features. There's no need to let go and re-grip your pencil every time you want to extend the lead. Just shake the pencil up and down! You can also push the clip downward—this conventional click mechanism is very smooth and easy. To lock the shaker mechanism, push the clip upward. When locked, you don't have to worry about accidentally extending the lead; even when you shake the pencil, the lead will not come out. The long guide pipe lets you see where you're drawing or writing. The popular Tombow Mono eraser is installed at the top with a twist mechanism and usable length of approximately 0.7 inches (1.8 cm). This attractive pencil has a metallic blue body, transparent gray grip area, and clear clip.