Pentel Pointliner Pens are waterproof and great for lettering and making clean, solid lines in varying widths. Also, perfect for shading techniques such as cross hatching and stippling. The permanent ink integrates well with watercolor washes. Their durable plastic nibs won't degrade or split over time and the ink dries quickly. Available in 11 differnt tip sizes in black ink. The 0.5 mm tip size is also available in gray, sepia and sangiune ink.