Pilot G2 Retractable Gel Ink Rollerball Pen - Black (0.5 mm)
Pilot's G2 is one of the most popular gel pens. They write smoothly, and has a contoured rubber grip section that reduces hand fatigue from prolonged writing.
The pens are retractable, so you don't have to worry about losing pen caps again.
Available in singles and a dozen (box). Refills are sold separately.