Never worry about lead breaking again! The DelGuard pencil uses an innovative mechanism developed by Zebra that prevents lead breakage. The secret is in the moving parts inside the pencil tip and grip area. How exactly does it work? If you apply vertical pressure to the lead as you write, a spring inside the pencil absorbs the pressure and allows the lead to retract a little so that it's protected by the guide pipe. If you apply diagonal pressure, the guide pipe and tip which guard the lead extend further out, thus protecting more of the lead. Even if you write with a heavy hand, your lead will survive. Lead clogging is also prevented, because the internal parts guard the lead. Even those small bits won't get misaligned and clog the pencil! However, if you extend the lead by clicking four times or more, the lead may break while writing. The pencil writes smoothly, and your thoughts won't be interrupted by the annoyance of lead breaking. Your concentration will see great improvement!
This is the Pink pencil. Close-up photos showing the tip mechanism feature the Blue pencil.
Also pictured: Maruman Mnemosyne Inspiration Notebook, Kokuyo Campus Notebook - Dotted Rule.