High precision technical pen with refillable ink reservoir, in 13 line widths. High precision tip:Wear-resistant, hard chrome-plated thin tip allows working in exquisite detail. rOtring technical pen ink (not included).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 bottle not included. Ink reservoir Refillable ink reservoir ideal for frequent drawers using bottle inks.