SMOOTH - Bolt Action Pen V2.2The SMOOTH Bolt Action Pen V2. 2 Is The Ultimate Lightweight Writing Machine Using Swiss Lathe technology, we manufacture our pens from high quality zirconium, titanium, copper, and bronze to the same standard as medical devices and luxury timepieces to ensure power and precision. Most Precise Pen on the Market Our machines hold 0. 0005" tolerances. We inspect every pen under 12x magnification for blemishes prior to shipping. You will feel the quality.