The ZEBRA DelGuard mechanical pencil features a system designed to protect the lead from different directions and a spacer that fills gaps inside the mechanism to help reduce lead jamming. It uses 0.3mm lead and measures 137.3mm in length.
Features
For vertical pressure, an upper spring absorbs pressure and allows the lead to move upward.
For diagonal pressure, a lower spring absorbs pressure and the tip extends to guard the lead.
A spacer fills gaps inside the mechanism to help reduce lead jamming.
How to Use
When no lead is extended, writing after clicking the pencil four or more times may cause the lead to break.