Our gradient pens feature a range of color transitions, so exact shades may vary slightly. The color options shown represent the closest match, but in-between shades (e.g., teal between blue and green) may also appear. Metallic and non-metallic variations are noted where applicable. Crystal Titanium® is a proprietary, custom metal—patented and manufactured by Architectural Titanium. It starts as mill-finish titanium sheets or plates, which are secured in specialized fixtures and placed in a high-vacuum furnace—equivalent to the vacuum of outer space. The metal is gradually heated to near-melting temperatures, transforming it into something truly extraordinary. This is version 3. Bolt Pens of the past have a protruding bolt that would get hung-up in/on your pants or shirt, or they would likely snag on something as you pulled it out of your bag.   By making the pen Oval we were able keep the bolt flushed with the body of the pen and only in the extended position would the bolt be slightly higher than the frame of the pen body.  This slightly raised position of the bolt would allow easy purchase when retracting the writing point.  Sleek and unobtrusive.  5.12 in long with a deep pocket clip in Zirconium, Titanium and Copper.  REFILLS: Parker Standard