The Uni-Ball Eye Rollerball Pen features a robust, fine 0.5mm nib for clear, precise lines of detailed work. The pen contains liquid, pigment, Super Ink, which is fade resistant, water resistant and tamper proof; excellent for important documents, journaling, school work and essential notes. The unique 'uni-flow' system provides a continuous flow of ink down to the last drop for smooth, consistent writing. This pack contains 12 blue pens.