BIC Cristal Pens Pack of 10; Our Biros multipack black boxes contain 10 of our classic black biros, great stationery supplies for use at home, school, or the office Black Ink Pens; Each writing pen in this pen set contains black ink only; Black biro pens are great pens for school examinations or administrative forms with strict ink colour requirements;​ Black Pens that are Smudge Free; These Biro pens have a 1.0mm medium nib, allowing for clear 0.4mm line width writing; BIC's black 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 classic transparent, comfortable hexagonal barrel is great for checking ink levels;​ BIC Pens Proud 80 plus 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;​