Rollerball Pen With Replaceable European Size Topball 850 Refill, Line Width Approx. 0.5 Mm. Writing Colour Green. The Conical Tip Made From Wear-Resistant Stainless Steel Is Ideally Suited For Comfortable And Striking Writing. The Cap-Off Ink Does Not Run Dry Even If The Cap Is Removed For 2–3 Days. The Topball 811 Can Be Refilled With European Size Ink Refills.