This is a great mechanical pencil.  It's very light weight plastic, but it seems to be pretty rugged.  So far, after about a month of use, it hasn't jammed, broken up the lead, or malfunctioned in any way.  One thing to be aware of is that there is no eraser on this pencil.  When you pull off the little clicker button, there's just a feeder tube for the lead.  The best feature of this pencil is the shape.  It's a flattened tube; it would be rectangular in cross section.  This makes it very comfortable to hold without slipping or rolling in your fingers.  It also makes it impossible to roll off of a desk, hit the floor, bend the tip, and smash the lead.  Been there, done that...