This tactical pen is 4 3/4" when closed with the Lancet end attachment. The pen is 5" open with the cap screwed on the back. The aluminum construction provides strength and durability with the pen still being lightweight. The matte finish and stainless pocket clip give the pen a tactical look and make it easy to clip to a pocket. The pen includes two end attachments (Lancet & TriStep) that can be switched out for different applications as a glass breaker or self-defense tool. Compatible with Fisher Space Pen pressurized refills.