Set of 6 Black Fineliners. Simply Fineliners are water-based pigmented inks ideal for fine detail work, writing, sketching, drawing, underlining, journaling, illustrating. They are permanent, water-resistant, quick-drying, and acid-free. . Set contains fineliners in an assortment of nib sizes: 0.05; 0.1; 0.2; 0.3; 0.5; 0.8 mm.