Gel ink roller ball pen refill GELION 39 Product can be used with: Gel Pen GELION 1 as well as all cutter models that have an universal plug + play shape ballpoint pen. Type: large-capacity refill ISO Size G2. Type of ink: water-based gel ink, waterproof, fade-resistant, waterproof. Cartridge Type: Wear resistant Jumbo Stainless Steel Tip, 0.4 mm) – Black. Schneider and leads Ballpoint Pens with the plug + play symbol of each other. This makes changing the lead can be easily.