Made from anodized aluminum, the Grafton is expertly weighted to provide a balanced in-hand feel. The grooved section ensures a comfortable grip, and the tip extends and retracts with a single satisfying click. When you’re done writing, tuck the pen in your shirt or pants pocket; along with providing a secure hold, the bolt-on brass clip peeks out and lends rugged, industrial appeal. For use with Grafton refills, Fisher Space Pen ballpoint, Monteverde ballpoint, and Parker gel and ballpoint refill cartridges, use the spacer and spring that come inside the pen. For use with BIC Gel, Uni-ball Jetstream, and Pilot G2, use the spring you'll find in the foam/box.