Archival roller system with smooth, pigmented ink delivered through the long-lasting ball delivery system. Acid-free, archival safe ink is ideal for sketching, drawing, manga art and so much more. The tungsten carbide roller tip guarantees a consistent line from the first to last drop of ink. Pigmented ink is light-fast, bleed-proof, water-resistant and fade-resistant. Available in four line sizes: 0.3mm (extra-fine), 0.4mm (fine), 0.5mm (medium), and 0.6mm (bold).