Zebra Tect Two-Way Mechanical Pencil 0.5 Silver MA41-S

[Shake-to-Advance Pen Function ON] Turn the center of the barrel to the right to extend the lead simply by shaking it. [Shake-to-Advance Pen Function OFF] Turn the center of the barrel to the left to lock the weight inside the barrel, providing a low center of gravity for stable writing. [Drafting Pen Tip] Long, extra-fine tip pipe for a wide field of view and clear visibility of what's happening near your hand. [Specifications] Upper barrel: Resin, painted finish / Lower barrel: Brass, plated finish / With silicone ring grip. [Size] Overall length 149 x Maximum barrel diameter 10.5 mm / Weight 23.6 g