This pack of 5 uni-ball Air Pens uses black ink and allows for versatile writing with the same quality of a fountain pen and the convenience of a rollerball, perfect as an everyday pen for use at home, in schools or in the office.This pen is a medium rollerball with all of the sophistication of a quality fountain pen - but without the mess. It\'s easy to use, simply increase the amount of pressure that you put on the pen for a thicker line. This pack is made with plastic free packaging making it an environmentally friendly alternative to plastic.. Pack of 5. Medium 0.7mm line. Writes like a fountain pen - without leaking . Plastic Free Packaging. Adjustable line width - Apply more pressure for a thicker line . Fade Resistant, Water Resistant, Tamper Proof. Approximate dimensions (mm) H 179 W 110 D 20