Zen Rollerball / Gunmetal - Resin / Cobalt SteelZen rollerball with a gunmetal finish. This is a unique pen that has a magnetic cap that's postable on either end of the pen. The body is done with one of our custom resin mixes called "Cobalt Steel". It features a solid black and gray with cobalt blue pearl that really adds some depth. Pen uses any standard rollerball refill.