Kohinoor Rapidograph Stainless Steel Technical Pen 0.18 mm (4X0)

Koh-I-Noor Rapidograph refillable pens have a white plastic barrel with a refillable ink reservoir (ink not included), and color-coded caps and nibs made from stainless steel. The double-seal cap is air-tight to keep the point from drying out. Each pen is identified by a standard point size or by its line width expressed in millimeters. (Point sizes do not correspond to points in the point/pica system of typographic measure.) This technical pen can be used on paper, vellum or tracing paper. Koh-I-Noor Rapidograph pens lay down dense, even flowing ink lines of controlled and predetermined widths. A remarkably versatile technical pen for use with all Koh-I-Noor inks. It handles like a pencil, moving in all directions without snagging or digging into the drawing surface."