Uni-ball's Eye pen has been one of the world's favourite rollerballs for over 20 years. The uni-ball Eye Micro contains uni Super Ink, which is fade resistant, water resistant and tamper proof. A unique 'uni-flow' system ensures a continuous flow of ink right down to the last drop. Uni-Ball Eye Micro Rollerball Pens have a unique design with a handy see through window which allows you to monitor how much ink is left. Each pen contains a smooth writing rollerball nib so they're perfect for your everyday writing needs.