This set contains 12 black line art pens comes with different nib sizes, include 0.23mm (005), 0.25mm (01), 0.3mm (02), 0.38mm (03), 0.40mm(04), 0.45mm (05), 0.50mm (06), 0.52mm (08), 1.0mm (1), 2.0mm (2),3.0mm (3), and a brush, offering a variety of sizes for your needs, these black drawing pens are ideal for drawing, taking notes, hand lettering and sketching