Here is a great (and cheap) alternate to the tactical pen… The perfect mix of technical drafting pencil with an industrial design features a 4mm fixed sleeve for template work and technical drawings. Metallic-mesh grip for precision and control. Available in 0.5mm, 0.7mm and 0.9mm. Colors: black, blue, green (shown), red, and yellow. Refillable with Pentel Super Hi-Polymer Lead and Z2-1 refill eraser.