Brass Ballpoint Pen with Keyring, Screw-off Cap, Handy EDC Pen, Refillable with Parker G2 Ballpoint Cartridge, Fisher Space PR Series Refills (Smooth)

This was solid pen. It did exactly what I wanted. Until the cap unscrewed and it fell off my ID badge into that place where things that are hopelessly lost go. Now I have a solid brass cap attached to my badge that doesn't do anything I want it to. It probably wasn't it's fault. I'll try again sooner or later. If you are looking for a small (the pen barely fit my average sized hand) that hangs around by a solid little ring, then this one is it. It also takes Parker style refills, which means the Fisher space pen refills fit it.