The Staedtler Stick 430 Ball Pen Medium Blue is of the highest quality. These pens are recommended for use in schools and the office. Comfortable shape to hold and write with. The pen cap and clip denotes the colour of the ink. It is airplane-safe, which means it has an automatic pressure equalisation which prevents the pen from leaking on board of an aircraft. The stick 430 ballpoint pen is ideal writing pen for kids, students and adults in school, university and in the office.