The highly economical 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 range of line widths. Metal surround protects the nib and makes these pens suitable for use with stencils. Dark grey ink - part of Uni's Super Ink range - fade-resistant, water-resistant and tamper-proof.