Fine points are typically about 0.9–1.3 mm, while extra-fine points are around 0.7–1.0 mm. A few tools also list a 0.5 mm fine-line option for very delicate work.
Gold paint pens produce metallic, shimmering finishes for bold, shiny coverage as well as matte metallic or smooth opaque finishes. Some pens specifically highlight a shimmer effect while others emphasize a smooth, matte look.
Many pens are described as mixable and layerable, allowing color blending. Their quick-drying, opaque formulas often layer cleanly without smudging or bleed-through on appropriate surfaces.
Multiple listings specify a suggested age of 3 years and up; at least one listing explicitly notes suitability for children ages 3 and over.
Features that extend longevity include durable nylon or synthetic brush tips that hold their shape, replaceable or reversible tips, push-plunger ink delivery systems, and sturdy pen barrels with durable acrylic tips.
