The Zig Writer pen has pigment ink that is acid-free, archival quality, lightfast, fade proof and non-bleeding with no smell or odor. Enjoy the smooth flowing comfort of a dual-tip pen, perfect for doodling, freestyle drawing and fabulous handwritten elements. Caps match the color of the ink. Bulk Pure Black- Dual tips - 0.5mm and 1.2mm. Remember to store this pen horizontally to keep ink supplied to both tips, so neither will dry out.