The SureFire™ Pen boasts a rugged aerospace-grade aluminum body with an ultra-durable Mil-Spec Type III hard anodized finish. This retractable-tip pen is appointed with a tumble-polished stainless steel tip, tailcap, and heavy-duty pocket clip. The sculpted tailcap features a rounded window breaker ready for emergency use. The SureFire Pen comes with a high-performance Schmidt® Technology easyFLOW ink cartridge, but adjusts to accept virtually any standard ink cartridge between 3.875" and 4.25" long. Smooth writing performance, elegant yet bold design, all in a spike-tough body ready for action whenever it's needed.