Colored Graphic Pen Collection, Etchr, Set of 16

Those looking to dabble with water-based media can take comfort knowing that the pens use water-based pigment ink for waterproof and fade-proof lines. Conforms to ASTM D 4236. 

PRODUCT DETAILS

Can I use watercolours over this ink? 

Yes, you can! These pens use waterproof ink, so you can use them with any water-based paints. 

What are the sizes of the needle nibs?

The needle nibs are 0.5 and 1mm.