Wanna zirc out your Fellhoelter pen? You can totally murder out your zirc pen, or add some black details to your pens in other materials. Comes with a zirconium bolt barrel and bolt handle.
Note: Neither Fellhoelter or your pals at Monkey Edge are responsible if ya bugger up your pen. You do need a bit of handiness to unscrew your existing ball from the bolt mech. Don't get all gorilla and end up breaking it.