The Uni Pin drawing pen features waterproof and fadeproof pigment ink, ideal for all types of art and design, including sketching and technical drawing. The steel-supported polyacetal nib is available in a wide range of line widths. Its metal surround protects the nib and makes these pens suitable for use with stencils. The black ink is part of Uni's Super Ink range, making it fade-resistant, water-resistant, and tamper-proof. This lightweight yet versatile drawing pen is designed to work well even with watercolours.