Calcomp direct fit plotter pens. Waterproof, fade-resistant ink for quality plots on paper, vellum and drafting film. Plotter pen nib size: 0.25mm, 0.35mm, 0.50mm, 0.70mm. Ink colors for paper: black, blue, green, red. Plotter pens fits the following plotters: Calcomp 1023, 1042, 1043, 1043GT; Artisan 1023, 1025; Artisan Plus 1023, 1025, 1026, 2024, 2036; Pacesetter 3024; Designmate 4024 Classic, 4036 Classic.