2.0mm Size of all colors set.(Black, Warm Gray, Cool Gray, Sepia, Cobalt Blue, Wine Red, Olive Green)* It is a pigment ink smooth drawing liner.* The Neopiko Line2 is allowed to be smooth drawing Liner with improved ink, nib than in the older models. * After dries Neopiko Line2 drawing, the ink will be waterproof and light stability.so there"s much less danger of it bleeding, whether you are using water-based markers or alcohol-based ones.