The DelGuard ER uses a spring in the barrel of the pencil lets the lead slide back into the pencil instead of breaking if too much vertical pressure is applied. 

Second, another spring in the tip dynamically extends the lead guard to protect the lead when too much sideways pressure is applied.

This Type-ER DelGuard also features an innovative eraser that makes correcting mistakes faster than ever. 

The eraser extends from the top cap automatically whenever you turn the pencil upside down.

A comfortable rubber grip section, a roll stop in place of a clip, and two replacement erasers.