Most medium-point red pens are listed as 1.0 mm; a smaller number of gel options use a 0.7 mm medium tip.
Ballpoint ink is the predominant type offered, with a smaller selection of gel ink pens also available.
Many listings highlight comfort features such as soft-touch or rubberized grips, triangular or contoured shapes, and no‑slip designs intended to reduce hand fatigue during extended writing.
Several pens use transparent or translucent barrels that let you see the remaining ink. Other listings explicitly note visible ink supply so you can monitor levels before they run out.
Many pens include pocket clips—plastic or metal—and several retractable models are designed for easy pocket or notebook carry.