The proto Aluminum Clickstream is 'unfinished' straight off the machining center for those who love a machined pen look. It's not polished or refined so when viewed at certain angles with reflections the subtle machining patterns are visible. Aluminum is a relatively soft metal, so this pen will readily develop scuffs and scratches to add to the raw finish.
Refill: The proto aluminum Clickstream ships with a OHTO Flashdry 0.5mm Black refill.