For a smooth and ergonomic writing experience, look no further than the STAEDTLER® triangular barreled ballpoint pens. Features indelible ink that conforms to ISO 12757-2, a transparent barrel so you can always be aware of how much ink is left, and is Airplane Safe - so automatic pressure equalisation prevents the pen from leaking onboard an aircraft and leaving an inky mess in your bag. Each cup of 50 pens contains 10 assorted colours for a vivid and fun solution to the everyday.