My main ball point pen is a Parker T-1 with an extra-fine Parker black refill. I used to carry a Bullet Space Pen with a fine black refill when wearing pocketless shirts, but I switched to an Inka Titanium Pen because it can be fastened to a key chain. The Inka refills are made by Fisher and are pressurized. I wish Fisher made an extra-fine refill. Parker used to make an extra-extra-fine (XXF) refill.