SWDR Pilot drawing pens are usally for professionals. The pigment ink used guarantees sharp, clean colour that is fast-drying and highly resistant to water and light. The tip is made in polyacetal and offered in 5 diameters to procure 5 sharp widths of stroke : (01) 0,5mm = 0,28mm, (02) 0,6mm = 0,35mm, (03) 0,8mm = 0,4mm, (05) 1,0mm = 0,5mm, (08) 1,2mm = 0,8mm.