Common color-ink pen types include ballpoint pens, gel pens, felt-tip (marker) pens, and erasable gel pens. Many multi-pen packs combine these types.
Common comfort and control features include rubber or contoured full-length grips, hexagonal barrels for a steadier hold, smoked translucent barrels to view ink levels, and pocket clips for easy carry.
Common set sizes shown are 4, 5, 6, 8, 12, 15, and 22 pens.
Typical convenience features are retractable tips, pocket clips, and built-in erasers on erasable models. Several listings also note a retractable clip with an eraser positioned at the top.
Tip styles include bold ballpoint tips (e.g., 1.6 mm) for thicker lines, medium/fine gel tips (0.7 mm) for smoother, more precise writing, and felt tips for bold, expressive strokes. Gel tips are often noted for vibrant, smear-resistant ink.
Erasable gel inks use a thermo-sensitive formula that can be removed by friction (erasing). Notes in the listings state heat above about 140°F can make the ink colorless and extreme cooling (around 14°F) can restore color. The listings advise against using these inks on legal or official documents.
