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.