Small enough to sit unnoticed in your pocket, the Pocket Pen measures under 80mm closed and extends to a full 132mm once the cap is posted, so it sits balanced in the hand and writes like a full-size pen. A hole through the base takes a key ring or a cord (sold separately), ready to carry with your keys or on a lanyard. The standard D1 cartridge writes smoothly and swaps out in seconds, with plenty of refills to choose from.
The Black Steel version is finished with an ultra hard, scratch resistant 4µm tungsten carbide layer which is 9x harder than stainless steel, and usually reserved for high performance cutting tools.