Caran d'Ache RN316 Fiber RollerballInspired by carbon fiber, the Caran d'Ache RNX. 316 Fiber roller pen features a marvel of entwined braiding, achieved with the precision and power of a laser. The writing instrument's highly polished finish provides a dramatic contrast to its matte decoration. It is equipped with an innovative cartridge changing mechanism, activated by a simple turn of the pen's end, and an ingenious click in system for cap closure. This pen, which uses a fine point