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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.
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: 128 mm long, 11 mm diameter. (5 in x 0.43 in)
  • Weight: Aluminum: 25 grams (0.88 oz). Steel: 48 grams (1.70 oz).
  • Aluminum or steel body. Aluminum mechanism. Polished steel 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 208 reviews
Ced (Little Elm, US)
Incredible Pen

Love the minimal design, it felt incredibly sturdy in the hand and was a joy to write with. Almost as soon as I received my pen, I lost it however, so I have ordered a mark two to try out! Maybe the clip will help.


Absolutely love this pen
Definitely my top one

William Creen (Riverside, US)
I must own them all!

I absolutely love the mark one. I look for opportunities to write now. It's so smoothe and it feels fantastic in my hand. I love the clicking mechanism as I tend to click like a maniac when deep in thought. I love this pen so much that as soon as the steel version was back in stock I ordered it. I will be back for the black steel mark one soon. I must have them all!

Jimi Lino (East Hanover, US)
Not solid steel?

My pen just arrived. I got the all black and copper. It says solid steel. I did a magnet on it and did not hold. The pen looks amazing. But not solid steel.

Shane Austin (Bloomington, US)
My new favorite pen!

I love the Mark One! It has gotten me to start writing again which really puts my brain in a more mindful place. The pen really feels seemless in your hand. It has also introduced me to the world of pen refills / cartridges. These are a very personal and subjective thing, but I wasn't a big fan of the Schmidt P8126 that it comes with, but I know I am in the minority on that one. I purchased, and now favor, an Ohto PG-105NP Flash Dry 0.5mm needle point refill. I must say, in my opinion it makes it the perfect writing experience for me at my desk. I will need to check out the Mark Two for a EDC pen. Studio Neat seems to be a really thoughtful, friendly, and unique company! :)