The Uni-Ball Fineliner Pen is a great choice for professional and beginner artists or designers and at such a low price this is one of the most popular pens. Pin range fineliners contain super ink which makes what you scribble down waterproof, fade resistant and even tamper proof making it incredibly difficult to fraudulently change any sensitive documents. Which all means if you like to work with other liquid based mediums such as watercolours then the ink will not smudge so it\'s a great choice. Built with a functional design and strong steel nib attached, the PIN fineliner is a solid choice for writing and drawing. - Tips: 0.1mm - Single Uni Pin - Colour is Dark Grey - Big range of other nib sizes making the Pin range useful for illustrators and designers of all skill levels - Smooth and consistent ink flow - Features high quality Super Ink that is waterproof, fade resistant and tamper proof