This set of 12 waterborne coloring pens features non-toxic, 0.4 mm fine tips encased in hard metal for precision and durability, ideal for detailed work with rulers and stencils. The pens contain quick-drying, smudge-resistant, acid-free ink, suitable for left-handed artists. With triangular barrels, they ensure a comfortable grip for activities like doodling, designing, or note-taking.