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. Details:Includes assorted colorsRobust M-tip (line width approx. 1 mm) for even ink application18 fiber tip pensOdor-freeWater-based inkHexagonal body for comfortable grip