The The Pilot SW-DR Technical Drawing Pen Range features premium, lightfast and water-resistant document pigment ink. Its highly durable, wear-resistant polyacetal felt tip maintains precise structure. A specialized multiple-channel internal irrigation matrix completely guarantees a uniform ink flow without leaking. This quick-drying formula helps illustrators eliminate accidental hand smudging during detailed drafting. The unique pen cap circulation system prevents the point from drying out. It delivers outstanding creative performance for technical sketches and professional architectural layouts. Available in 1.0, 2.0, 3.0, 5.0 and 8.0.