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! These sets include a variety of vibrant colors in convenient metal tins. Details:Includes assorted colors6 sets (50 pens per set, 300 total pens)Fiber tipsCap-off time of up to 24 hoursOdorless, water-based inkIncludes metal tin