The Pentel Arts Hybrid Technica gel pen contains acid-free, water-resistant, archival ink that will protect your sketches, drawings and anime from fading over time. Archival roller system with smooth, pigmented ink delivered through the long-lasting ball delivery system. The tungsten carbide roller tip guarantees a consistent line. Pigmented ink is light-fast, bleed-proof, water-resistant and fade-resistant. Acid-free, archival safe ink is ideal for sketching, drawing, manga art and so much more. Each pack includes 5 pens in 5 line sizes: 0.3mm (extra-fine), 0.4mm (fine), 0.5mm (medium), 0.6mm (bold), and 0.8mm. 5-Pack