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. The metal surround protects the nib and makes these pens suitable for use with stencils. This pen has black ink, which is part of Uni's Super Ink range, making it fade-resistant, water-resistant, and tamper-proof. The pen is lightweight yet versatile and designed to work well with watercolours. Its ultra-fine marker has a smooth feel.