Never worry about tired hands from writing again! This Type-GR DelGuard also features a soft, ergonomic grip section. Its special two-layer design disperses the pressure on your fingertips to minimize finger pain and fatigue during long writing sessions. And the DelGuard utilizes an ingenious two-part system that makes it virtually impossible to break the lead. First, 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. It may sound complicated, but it really works! Lead Size - Diameter: 0.5 mm Length: 138 mm / 5.4 inch