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Mark One

A Minimal, Durable, Retractable Pen
Mark One is a custom machined, all-metal, retractable pen with a ceramic based exterior coating for long lasting durability. It’s built for our favorite rollerball refill, and has a satisfying-as-heck custom click mechanism.
Mark One is backordered for US orders but will resume shipping in about a week.
Looking for ink refills? Get them here.
The perfect pen to match an already great notebook.
It’s literally seamless.
Mark One has a completely seamless design, which was quite an engineering feat. The pen has no excess ornamentation or logo, and comes in two colors: black or white. The metal plated nocks provide a nice little accent to each, and give Mark One a sophisticated look without looking overly tactical.
The tip and end of Mark One with no seams.
Made to last a lifetime.
Mark One is incredibly durable. It is made entirely out of metal, including the custom click mechanism. The pen is coated with Cerakote, which is an extremely durable ceramic-polymer coating (technical specifications for Cerakote). It gives the pen a really nice, matte feel. This pen should last a lifetime.
A cut-away of the all metal construction of the Mark One body and mechanism.
A completely custom click mechanism.
There are many off-the-shelf click mechanisms we could have used, but none of them were quite right for what we wanted, so naturally, we made our own. It is made entirely out of metal and, as far as we know, it is the only all-metal mechanism on the market that has an actual “click” action. It is satisfying as heck to click.
The five complex parts of the Mark One mechanism.
Built for an amazing rollerball refill.
Mark One ships with our favorite refill, the Schmidt P8126 rollerball. This is a fantastic cartridge; the ink flows smoothly and dries quickly. However, Mark One will accept any Parker-style refill, which means there are many options for pen cartridges that our pen will accept. This list from Well-Appointed Desk is quite comprehensive. Purchase more refills here.
The small Schmidt P8126 ink refill on it's side.


  • Dimensions: 128mm long, 11mm diameter. (5in x 0.43in)
  • Weight: 25 grams (0.88oz)
  • Aluminum body and mechanism. Nickel and copper plated aluminum knock.
  • Cerakote coating, matte finish. See technical specifications for Cerakote.
  • Included Refill: Schmidt P8126. Black ink with 0.6mm tip diameter.

Customer Reviews

Based on 18 reviews
Jeff Bastedo (Cape Coral, US)

Mark One

Jeff Hassen (Los Angeles, US)
Minimalist design

Love the minimalist design, barrel size/grip and smooth writing. Just what I was looking for.

April Willis (Manor, US)
Birthday gift

My brother loves the pen. So happy I found a gift that met his needs and made him happy!

Adam Spacke (Chicago, US)
So far, so great!

I can't stop clicking them! I ordered both the black and white Mark One. These pens have a great weight to them and are smooth to write with so far. Would recommend for anyone in market to kick up their pen game or as a gift idea.

Cody L (Sturgeon Bay, US)
Made me a pen-snob

I've always been very practical when it came to pens; if a pen wrote and didn't smear, then it was a good pen. Not any more. I bought my first Mark One and immediately fell in love with the perfectly balanced weight, satisfying click, and how it made me feel when using it. I'm now a snob and my heart sinks whenever I have to write with anything else (even other nice pens with the same ink cartridge). The fix? I bought two more so I always have a Mark One nearby. Thanks for spoiling me, Studio Neat.