With their sturdy bullet tips and brilliant, intense colors, Pen 68 fiber tip pens are perfect for layout, detail and sketching. The odorless water-based ink will not bleed or dissolve toner or ink of permanent markers. Pens can be left without their cap for 24 hours without drying out. Color-intensive premium felt-tip pen for strong lines and large areas, Robust M-tip (line width approx. 1 mm) for even ink application, Odor-free Brand: Stabilo