With the guarantee of value and high quality of the Specialist Crafts Spectrum brand this perfect selection of Technical Pens comes in the three most popular point sizes.The extra-long metal casing around the nib makes it ideal for ruling work and technical drawing.The black pigment ink is water-based acid-free fade-proof xylene-free and water-resistant once dry.Nib widths are: 0.1 0.3 and 0.5mm.