Barrel materials vary by product: some pens use metal or stainless‑steel construction, while others use durable or recycled plastics. A few listings show pens with metal components paired with plastic parts.
Some packs include extra refills (one example lists 8 refills), while several pens are advertised as refillable or equipped with long‑life cartridges. Availability of refills and refillable designs varies by listing.
Commonly highlighted traits are smooth, consistent writing (especially at fine points), quick‑drying formulas, and minimal smudging.
Pack sizes in the results include 2, 3, 4, 6, 8, and 10 pens, so the observed range is 2–10 pens per pack.
Several listings advertise quick‑drying ink and anti‑smear or no‑smudge formulations intended to reduce smearing while writing.