The Uniball Pin Fine Liner Brush Drawing Pen is designed to help any budding artist create their next marvellous masterpiece with ease. Featuring both fade resistant and waterproof ink, a steel-protected nib, and even a handy clip-fastening, this lightweight yet versatile drawing pen is designed to even work well with the use of watercolours. Single technical drawing fineliner pen from uni-ball's Pin range. Uniball PIN Water and Fade-Proof Drawing Pen The Uniball Pin is a water-resistant drawing pen, ideal for all types of art and design. Available in a choice of colours and nib sizes.