New - (10) Vintage Antique Rotring Isograph Art Pen Ink Nibs - Rotring Isograph (10) Black Ink Cartridges. High density of pigment particles for opacity and lightfastness. Line sharpness and adhesiveness. Fast drying on media. Waterproofness. Can be used on a variety of surfaces such as lineboard, tracing paper or vellum drawing paper. Ink cartridges for ArtPens. High intensity for the optimum quality of your drawing and writing publications. New pack of ten ink cartridges. Made in Germany. Selling all (10) for $30