With their sturdy bullet tips and brilliant, intense colors, these fiber tip pens are perfect for layout detail and sketching. The odorless water-based ink will not bleed. It also will not 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. The set of 46 contains 50 pens; one each in 42 colors and two each in 4 colors (black, carmine, ultramarine, green).