Zebra Tect 2-Way Mechanical Pencil 0.5 - Red combines drafting precision with a dual-function mechanism that adapts to every writing style. The shake-to-advance system can be switched on for effortless lead extension or locked off to provide a stable, low-center-of-gravity feel. With a long, slim drafting tip that keeps your line of sight clear, it offers controlled, reliable performance for notes, sketches, and technical work.