Ironlak Technical Drawing Pens use a water based pigment that will flow unencumbered from your hand to the paper. You can rely on a steady stream of bleed-free ink, no matter how small the details or how restricted the surface area. Get in close and really bring your work to life. Our ink pigment is fully compatible with Ironlak Watercolour Pencils, and will cover equally well over alcohol based markers – including the Ironlak Striker range. Hash out finely detailed technical drawings, or add depth and richness to larger sketches – the choice is yours. Our proprietary pigment is light fast, permanent, and waterproof – so you can trust that your work will be of archival quality.