Pack sizes vary widely; common quantities shown include 3, 5, 6, 12, 15, and 18 pens per pack.
Erasable planner pens use thermo‑sensitive ink that can be removed with an eraser built into the pen. Listings note temperature sensitivity and advise against using these inks on legal documents.
Many sets are multicolored. Colors explicitly shown across listings include black, blue, red, green, pink, purple, orange, brown, yellow, turquoise, magenta, lime, and mocha.
Several listings highlight quick‑drying or smear‑resistant inks. Examples include claims like 'dries quickly,' 'dries 3x faster for reduced smearing,' and gel formulas that dry in as little as five seconds.
