Uni-ball Uni Pin Fineliners, 0.03mm, Extreme Micro Lines, Pigment Ink, Comfortable Grip, Ideal for Technical Wrting & Drawing, Black – Box of 12

Key specs: 0.03 mm ultra-micro line width, archival pigment ink that’s waterproof and lightfast, metal sleeve to guard the tip on guides, quick-set ink to reduce smears during layered detail work, and a capped design to prevent dry-out and tip damage.

Ideal for technical drawing, tiny labeling, micro-detailing in architectural plans, map sketching, precise journaling, and any work requiring extremely fine lines and clean, consistent strokes.

Hold the pen at a comfortable, slightly shallow angle and use light, consistent strokes. Use a ruler or straightedge with the metal sleeve to guide straight lines, and let each layer dry briefly before adding more to prevent smudging.

Keep the pen capped when not drawing, and store it in a designated box or sleeve to prevent the tip from bending or drying. The capped design helps maintain the tip's readiness for precise work.

The pen uses pigment ink designed for archival, water-resistant performance. As with any writing instrument, avoid contact with eyes and mouth, keep away from small children, and use in well-ventilated areas if you’re sensitive to fumes from other markers.

The 0.03 mm version offers finer lines suitable for ultra-detailed work, while the 0.05 mm provides a slightly bolder line for more legible micro-labels, and the 0.1 mm yields broader lines for quicker sketches. If you need the most detailed detail, choose 0.03 mm; for a balance between speed and precision, 0.05 mm; for clearer, faster lines, 0.1 mm.

You can explore related Uni Pin Fineliners on Fepy to compare line widths and packaging: - 0.05 mm variant: https://fepy.com/product/uni-ball-uni-pin-fineliner-0-05mm-black-box-12 - 0.1 mm variant: https://fepy.com/product/uni-ball-uni-pin-fineliner-0-1mm-black-box-12 - 0.03 mm variant (different pack): https://fepy.com/product/uni-ball-uni-pin-fineliner-0-03mm-black-box-6

Let ink set briefly between passes to reduce smearing, apply light strokes rather than pressing hard, and rely on the metal sleeve to guide straight lines. Working in thin, deliberate passes helps maintain crisp, even lines on complex pieces.

Use the pen with the metal sleeve as a guide to minimize tip contact with hard edges, avoid excessive pressure, and cap the pen promptly after use. Drawing near guides and edges can wear the tip faster, so use rulers and light touches for longer life.

This model is sold as a box of 12 pens, which provides a reliable stock for extended micro-detail projects and ensures you have replacement pens ready when one tip starts to wear. It’s a convenient option for consistent, long-form technical work.