Fisher Space Pen Trekker Space Pen has the pressurised ink you know from their Bullet Pens and AG7. It enables writing upside down, in every angle, underwater, on top of grease and in extreme temperatures.
This pen is "the Bomb" for so many different folks. Are you an executive? Put it on your keychain and always have a quality writing instrument at hand.
Police/Fire/Ambulance...clip it to your belt, and it will sail through the daily abuse it will get! Students love this on their school lanyard. It's the choice of mountain climbers, sojourners, farmers, and security guards.
This pen has a PR4 pressurised black medium ink cartridge.