BIC Cristal Pens Pack of 50; Our Biros multipack black boxes contain 50 of our iconic green biros, ideal stationery supplies for use at home, school, or the office. A pack of pens for the entire team!​ Green Pen Ink; Each writing pen in this pen set contains green ink only. Green biro pens are perfect pens for schoolwork marking or note taking. Each pen contains enough ink to write for up to 3km. Green Pens that are Smudge Free; These Biro pens have a 1.0mm medium nib, allowing for clear 0.4mm line width writing. BIC's ballpoint pens have been trusted for decades.​ Writing Pens Used Worldwide; The classic BIC Cristal Original pen is the world’s best-selling ballpoint pen. It's iconic transparent, comfortable hexagonal barrel is perfect for checking ink levels.​ BIC Pens Proud 80+ Year History; BIC began in 1944 with a simple goal in mind, to create a product that would answer the fundamental consumer need for a smooth, effortless writing tool.​