Pen Pencil from Zebra is the latest mechanical pen that solves the problems of broken cores and clogged cores. The newly developed DelGuard system protects the core from all directions. In a conventional mechanical pen, the tip of the pen aids in breaking the lead when the tip pressure is applied to the tip more than necessary. DelGuard 0.5mm & 0.7mm Pen Pencil By solving this problem with the DelGuard system, even if you write fast or slow, you can't break anymore. So you can write it all day. In conventional mechanical pencils, the core is broken inside the mechanical mechanism due to an external impact such as a drop, causing jamming. DelGuard solves this problem, so it won't clog anymore The best performance can be shown in the most important situations such as exams, studying and daily testing. Small bold sharp pencil