The Uni Pin Fine Line is a professional-grade drawing pen featuring water-resistant pigment ink and an ultra-fine 0.1mm tip. This precision instrument delivers consistent, fade-proof lines ideal for technical drawing, illustration, and detailed artwork. Key features: • 0.1mm Ultra-Fine Tip • Water-Resistant Pigment Ink • Fade-Proof Formula • Precise Line Control • Professional Drawing Quality • Black Ink Color • Ergonomic Design This pen is particularly valued by artists, architects, and designers for its reliability and precision. The water-resistant properties make it suitable for mixed media artwork where watercolor or other wet media may be applied over the lines. The ergonomic barrel design provides comfortable extended use, while the cap helps prevent the tip from drying out when not in use.