Zebra Tect Mechanical Pencil Black Blue Two-Way 0.5mm MA41-23-BKB

[Drafting Pen Nib] Long, extra-fine tip pipe for a wide field of view and good visibility of what you're doing. [Shake function ON] Turn the center of the barrel to the right and the lead will extend just by shaking it. [Shake function OFF] Turning the center of the barrel to the left locks the weight inside the barrel, resulting in a low center of gravity and stable writing. [Specifications] Upper barrel: Resin, painted finish / Lower barrel: Brass, plated finish / With silicone ring grip [Size] Overall length 149 x maximum shaft diameter 10.5 mm / Weight 23.6 g