The Fenix T5 Halberd is a Tactical Pen with an elaborately milled aluminum body that makes a striking first impression. The screw cap with openwork elements can be screwed to the bottom of the pen for writing. The cap is also secured with O-rings. The end of the pen is capped with a glass breaker of tungsten carbide. The T5 comes with a German Schmidt P950M gas pressurized refill but is also compatible with other standard large capacity refills.