Koh-I-Noor Rapidograph Technical Pens No. 3165 0.18 mm
KOH-I-NOOR RAPIDOGRAPH TECHNICAL PENS - Patented Rapidograph pens provide two airtight seals when pen is in clamped position. No humidification required. No spring-tension seal to jam with dried ink. For all drafting and graphic arts applications. Airtight dry double seal cap that allows instant startup for increased productivity. A consolidated range of point sizes, available in stainless steel. Rapidograph Stainless steel pens for use on paper or vellum.