uni-Eye Micro handwriting pens contain uni Super Ink which is fade resistant, water resistant and tamper proof. This makes these fine writing pens ideal for important documents, school work and notes to keep and treasure. The high quality rollerball pens have a unique \'uni-Flow\' system that ensures ink flows consistently to give you a smooth writing experience down to the last drop. So there\'s no need to worry about the pen jamming or ink suddenly running out. Its Micro 0.5mm nib is excellent for neat, clear handwriting.