Designed and manufactured with precision for optimum performance.Stations hold pens in ideal horizontal storage position with flexible double seals to prevent pens from drying.Keep pens ready to draw at any time.Individual pen stations can be taken from the set and affixed to table or drawing board with included double-sided tape.High-precision technical pens with refillable ink reservoir are ideal for frequent drawers.Push-on sleeve for ink helix access and fast cleaning.Wear-resistant, hard chrome-plated thin tips and stainless steel nibs allow exquisite detail work.Colour coded barrel indicates line width.Contains 4 Isograph pens (0.2MM, 0.3MM, 0.4MM, 0.5MM) and a compass attachment rOtring Isograph Technical Drawing Pens, Set, 4-Pen Set (.20-.50 mm).