red ink pen

Tip sizes vary by pen type. Common sizes shown include 1.0 mm (medium), 0.7 mm (fine), 0.5 mm (micro) for crisp lines, and a few listings even list a 5 mm point.

Common comfort features include rubber or contoured grips, fully wrapped comfort grips, and ergonomic, latex‑free grips designed for easier writing.

Larger tips such as 1.0 mm (medium) produce bolder, thicker lines, while finer tips or micro tips (for example 0.5 mm) create crisper, more precise lines.

Some rollerball‑style pens use liquid inks described as formulated to sink into paper; product details call these fade‑ and water‑resistant and archival‑quality (acid‑free) to help reduce check washing and document alteration.

Results include ballpoint and gel formulations, erasable thermo‑sensitive gel/fineliner inks, and liquid/rollerball ink types.

Many listings advertise quick‑drying ink. One gel description specifically states it "Dries 3x faster for reduced smearing," and several product notes list "Quick Drying."

Both styles appear: several sets are described as retractable click pens, while other entries list capped pens.