This Boker K.I.D. pen offers a tough titanium version of their popular tactical pen with a flame heat treated finish. It is the shorter version of the popular .45 CAL CID tactical defense pen. This model is significantly shorter and a little bigger in circumference with a classic clip. You will love to fidget with the effective bolt-action opening mechanism. This model has a flame heat treated finish and a smooth surface that is very comfortable in hand. Compatible with Fisher Space Pen refills #PR4.